My Terms and Conditions are very simple. I require 24 hours notice to cancel a lesson. As simple as that, if a lesson is not cancelled withing 24 hours of the start time I reserve the right to charge for the lesson in full. I will attempt to rescedule later in the week, but if that is not possible the lesson must still be paid for.
If I have to cancel a lesson at short notice I will also make every attempt to reschedule later that week. If that is not possible for the student then of course no fee is payable for the missed lesson as it will be due to my unavailability.