If you want to book a specific room and can't find it after filtering, there may be several reasons for this:
The room is unavailable during the desired time period.
The room is already booked.
The setup times for the room overlap with a booking before and/or after it.
You are trying to book on a weekend, and the room cannot be booked on weekends.
The room is an exclusive room and can only be booked by the room manager.