I would like a scheduling app for a clinic. Customers can sign in and then book an appointment among free slots. I would like a back end to this app that works on a tablet and where the clinic therapists will be able to confirm the booking or reject/offer alternative bookings. Also, i would like an admin end that can view all confirmed appointments that will belong to the owner. All 3 apps must have log-in. Front end can have social log-in. Back end log-ins/users can be created at the admin end.