There is no way to sync Sales Reps availability for when scheduling appointments. How does everyone else do this task?

The solution is something called a booking app. Think of your Barber shop, they have 4 stylists, and each stylist has time slots. If we are running 3 appointments/day, 10am, 2pm, 6pm, we need a way to book these slots based upon Sales rep availability. I could Buy a subscription to Booksy, or similar app, but we pay Nimbus as our CRM, why not incorporate this feature?
This function would allow events staff to quickly identify available time slots and minimize scheduling conflicts.