ariannasings

If I offer music lessons and I fill up all my time slots will people still be able to purchase a lesson OR will I be able to MARK that I can no longer accept gigs as I am at full capacity? For example If I am available to teach 4pm-6:30pm Monday & Thursdays for 30 minute lessons, and all times slots booked; that would be 10 students total. I'm worried that someone else will purchase a lesson and I will have no time slots available, what would I do?