I would gladly keep my appointment scheduled for this coming week...if I only had a reason.
May I make a suggestion? Perhaps automated appointment reminders aren't the best idea? Or maybe just have a real person go through them before they're shipped out...just to check and see if anyone has died or otherwise no longer needs a scheduled appointment?
(I'm rather sad to see that we had this go 'round a few years ago and you still haven't changed.)