The bookings system within LiteCMS is intended to be an easy way of showing your customer the availability of resources (be they hotel rooms, pieces of equipment for hire).
Availability can either be checked in a number of ways, such as
Availability check using date range picker
Ideal if you don't want to reveal the occupation rate of your hotel rooms for example.
Display in calendar form
Showing in calendar days that a particular resource is available will reveal to your customers all your available/booked dates. You might want to do this, if for example, you were showing which dates a particular vet/doctor was available to in the surgery.