The Sale That Starts After Check-In: Voice AI and the In-Stay Revenue Hotels Keep Losing

A few weeks ago, Mateo Bolívar, the founder of Contler, ran a test any traveler could repeat. He checked into the Hilton Bogotá Corferias, picked up the in-room phone, and dialed room service. There was no staged demo and no controlled environment. He simply recorded a real call, with a voice agent taking his order the way it would for any guest at three in the afternoon or two in the morning. The clip runs under a minute, yet it exposes a blind spot most hotels still fail to measure.

Almost every commercial muscle a hotel flexes is aimed at the moment before arrival. Dynamic rates, pre-arrival offers, metasearch bids, loyalty nudges. Once the guest walks through the door, the relationship tends to shift into neutral. And that is precisely where a meaningful slice of revenue lives: after check-in, when the guest is already inside and the card on file is active.

The Money in Play After the Key Card

Ancillary revenue has stopped being a pleasant afterthought. The global market for hotel ancillary revenue platforms was valued at roughly 4.2 billion dollars in 2025 and is projected to reach 9.3 billion by 2034. At some properties, revenue that does not come from selling the room accounts for nearly 40% of the total, and the industry generally treats a 20% to 30% share as the healthy target. Food and beverage remains, historically, the second largest source of revenue in the business.

Room service is the most awkward line item of all. Guests keep ordering it, but for many hotels it simply does not turn a profit, largely because of the labor required to answer the phone, take the order, and coordinate delivery. As hospitality analysts Robert Mandelbaum and Andrea Grigg put it, people still want to eat in their rooms even though traditional room service loses money. That tension is fueling contactless delivery models, where the guest is alerted that the tray is waiting at the door. None of it works, though, if no one answers the call in the first place.

A Phone That Rings With No One to Pick Up

This is where a variable no operator can ignore in 2025 comes in: staffing. The American Hotel and Lodging Association reports that 65% of hotels are short-staffed and 71% have openings they cannot fill despite active recruiting. The hardest-hit departments are housekeeping and front desk, followed by culinary roles. More than a third of hotels, 36%, say they have already cut services such as daily housekeeping for lack of hands. Guest service hours per occupied room fell 13.5% between January and September of that year.

In practice, that means a guest dials room service or the front desk and the phone simply keeps ringing. Not because the hotel does not care, but because the one person on shift is checking in a family, defusing a complaint, and chasing a lost bag at the same time. Every unanswered call is two losses stacked on top of each other: a guest whose experience just dipped, and a sale that quietly disappears.

From Taking Orders to Making Them

A voice agent does more than pick up. It answers on the first ring, understands the request, and, when configured well, recommends. The economics behind that are becoming hard to argue with. AI-powered recommendation engines are converting ancillary offers at 35% to 40%, against the 12% to 15% that traditional upselling used to deliver. Automated upselling lifts ancillary revenue per guest by 20% to 30%, and personalized offers convert three to five times better than generic ones. Hotels already running these systems report upselling revenue gains in the range of 15% to 30%.

What is striking is where that intelligence is being applied. Most upselling platforms still crowd into the pre-arrival window, firing offers 24 to 48 hours before the guest shows up. The stay itself, when the guest is actually hungry, wants a glass of wine, or asks about a late check-out, remains oddly underworked. A voice agent that answers every call during the stay turns that window into a standing point of sale, without waiting for an available clerk to remember to mention dessert.

No Six-Month Rollout Required

There is a fair objection here. Hotel technology tends to arrive wrapped in long contracts, endless integrations, and pilots that never quite end. Bolívar frames his approach as the opposite. His voice agents, he says, go live in under 72 hours, on a pay-per-use model with no long commitment. This is not a 360 platform promising to fix everything within a year. It is a narrow tool that runs today, on the same phone already sitting in the room. For an operator wary of big deployments, the gap between what sounds good in a deck and what moves the needle this week is the whole point.

None of this is a reason to buy hype. A voice agent is only as useful as its connection to the live menu, the kitchen hours, and real inventory, and it needs clear rules for handing off to a human when the moment calls for one. A live voice is still irreplaceable for the frustrated guest or the delicate situation. The reasonable promise is not to replace the team but to strip away the repetitive volume so staff can handle what genuinely requires judgment, capturing along the way the orders that currently die in an unanswered ring.

The underlying question is almost embarrassingly simple. If a hotel spends so much to win the guest, why leave to chance what that guest wants to buy once inside? The in-room phone has been treated as furniture for decades. It may be worth seeing it for what it can be again: the cash register closest to the pillow.