Nine o'clock.
The receptionist opens the diary and sees columns for the two practitioners in today, each column showing only the treatments they are qualified for.
A new patient rings to book a treatment that needs consultation first; the system offers consultation slots only, and the pre-consultation questionnaire goes to her phone with the confirmation.
The practitioner completes the consultation at eleven, records findings in notes the receptionist cannot open, and the cooling-off period starts.
The patient's treatment can be booked from the day it ends and not before, and the receptionist sees exactly that date.