I usually book with her office manager if she is still there and my appointment isn't after she is gone for the day..she usually works until afternoon time, then she leaves. If not with her then I schedule it with my T after our session. I thought most people have a certain day(s) and time of the week scheduled and set in place with their T. I know I can't hqve mine like that..I usually look to see what she has available for the next week and choose by what sounds best for me or what will work for me. I have never booked a session while in session though.