"Booking Requests" are not actual bookings - they first require approval by a user with sufficient privileges (a venue "Manager") before they become "confirmed" bookings.
Additionally, an administrator can make any MIDAS user account a "request only" account. In such instances, the regular "Add Booking" screen the logged-in user would see instead becomes a "Make a Booking Request" screen. Like "public" Booking Requests, booking requests made by logged-in users also require approval before being converted into "confirmed" bookings.