I've had to charge a few people in the past when they didn't show up for a lesson or cancelled on really short notice without a very good excuse. My normal policy is 24 hours, or if you have a family emergency you can cancel within 24 hours free of charge. Outside of that, I charge the full rate because I lost that money when I could have had someone else take that spot had I received more notice.
I'm wondering if any of you have been charged like that and it soured the relationship with you and your instructor. Have any of you called it quits with your instructor because of an inflexible cancellation policy?