If you arrive to check into a hotel and they have no record of your reservation and no rooms available, you aren’t completely out of luck. The first line of defense is to show them a printed copy of your reservation; this will confirm that it’s their mistake, not yours. Once you’ve proven that you have a record of the reservation, the vast majority of hotels will accommodate you at no charge at a similar hotel. This procedure is called “walking,” and if you politely ask the front desk to walk you to another hotel, the odds are good that you’ll be taken care of.