You have several options:
1. The booker (the person setting up the meeting) is optional in the meeting
In this case navigate to Assigned Meetings - Queues, select your queue & check this option in your queue settings
In this case, the booker availability is not taken into consideration for the meeting
2. The booker is automatically included to the meeting:
Select this option on the queue:
If you check this bottom box, the booker's availability will be taken into consideration (as well as the Assignee's) when a meeting is booked into this Queue.
Booker & Assignee scenario:
SDR = Booker
AE = Assignee
If the options in #2 are enabled, a meeting with a prospect will include both the SDR and AE on the invite automatically when a meeting is booked.