No-show
A no-show is a booking that never arrives: a slot you held, staffed and could have sold twice. Unlike a cancellation it gives you no chance to refill, which is why the two need different handling - cancellations need a notice window, no-shows need prevention. Three things reduce them: a reminder close enough to act on, a card held or deposit taken at booking, and a one-tap way to move the appointment.
In practice
A no-show is a slot you held, staffed and could have sold twice. Unlike a cancellation it gives you no chance to refill, which is why the two need different handling: cancellations need a notice window, no-shows need prevention.
Three things reduce them, in order of effect. A reminder close enough to the appointment to act on. A card held or a deposit taken at booking, which changes behaviour more than any message. And a one-tap way to move the appointment, because most no-shows are people who meant to come and were too embarrassed to ring.
Measuring matters as much as preventing: a no-show rate by day, by service and by whether a deposit was taken tells you exactly where to tighten up, and usually it is one slot on one day rather than the whole book.
Also called: missed appointment, no show rate.