The document discusses various types of reservations at hotels. It describes guaranteed reservations, which assure guests a room until a specified time after their scheduled arrival. There are several types of guaranteed reservations including prepayment, credit card, advance deposit, travel agent guarantees, and vouchers. Non-guaranteed reservations do not assure a room for late-arriving guests. The document also covers reservation and sales departments, and their roles in booking rooms far in advance to maximize revenue.