My T is hard to get into only if you wait awhile after a session to make appointments, so we'll schedule a few in advance. She saves several openings that are only visible on her end of the scheduling system so that clients can get in to see her quickly if needed - these slots, in other words, aren't able to be filled by the secretaries when they schedule for her. Knowing this, I make sure to set them up with T instead of with the receptionist.