1. Hotels often overbook rooms to try and ensure 100% occupancy by using historical data on no-shows to determine how many confirmed reservations they can accept beyond the number of actual available rooms. 2. Incidental hotel charges are for optional extra services guests may use like phone calls or valet parking, where the hotel gets approval for an estimated amount up front and then charges the actual amount used at checkout, depending on individual hotel policies. 3. When dealing with guest complaints, hotels should listen to the customer's issue, summarize the problem, offer possible solutions for them to choose from if applicable, follow through on the resolution, and follow up with the guest.