too many texts, too many reminders

The larger issue is this:

how many "touches" are the right number of touches?

we have plenty of no shows so apparently, we do not "touch" them enough.

Then there are the very responsible guys who do not need any reminders.

But we do not know who are the responsible professionals and who are the laggards.

My dentist sends 9 text confirmations starting the week before an appointment. I don't get upset even though I do not need any reminders. I realize that this is an automated system designed to eliminate no shows. Anyone who does not understand that and gets bent out of shape by that, we likely do not want as a client.