A no-show is rarely a surprise in hindsight. It is usually a communication that did not happen.
Why it matters
Count what a single one costs: the drive in, the wait, the drive out, the note, the call, the rescheduled visit and its own drive. Forty minutes of paid time and no revenue, twice. Three no-shows a week per technician is most of a working day lost across a small team.
The second cost is to the route. A no-show leaves a hole in the middle of a planned day, and holes get filled badly.
How you notice it slipping
The rate is not measured at all, or is measured as a single company number rather than by work type and by time of day. Interior services booked for midday on weekdays will always produce more of them, and that is a booking decision, not bad luck.
What to do
Track the rate by service type and by slot. Then fix the booking pattern first and the reminders second: a confirmed window the day before and an on-the-way message remove most of the avoidable ones, but neither will rescue an appointment that was never realistic for that household.