The Share Calendar Feature or Work With a Friend Feature enables you to Share your Availability with your friends. They will have the priority in matching with you even is in the meantime you are booked by someone else.
Book a session/sessions you want to work on something
Go to the share button in the up-right corner
Pick the dates you want to share from your calendar
Copy the link to clipboard and send the link to your friend/friends. They will be able to see only the sessions you chose to share.
Your friend will also have the priority in matching.
Give it a try! Create a an account and schedule your first session.