I make a note of it, and should they want another appoinment, im the one who pickes the time. I let them know they've wasted my time should they keep doing it and even on walk in basis, pick and choose. Three strikes and your out! Mind you i tend not to get many no shows, it always seems to be phantom bookings by other therapists. I dont charge for no shows, but i let other staff members know, who the time wasters are, and to let them know for future bookings, payment may be required in full.