How to handle it when a booking isn't closed after the hotel is fully booked

Let me share a down-to-earth experience. During a night shift at the hotel front desk, I encountered an OTA overselling issue where the system showed we were fully booked, but a third-party platform still sent in two confirmed bookings. Guests arrived in the middle of the night with no rooms available. The situation wasn't exactly out of control at the time, but letting it drag on would…