If the contact functionality is implemented as in the application here: https://feedback.savvycal.com/feature-requests/p/show-a-client-list-with-their-information-and-list-of-appointments-booked

Then it would be very interesting to be able to assign a time limit to each of the contacts.

For example: this contact has the right to book for 6 hours. Once the 6 hours have elapsed, it can no longer make a reservation.