What if I miss a session?

I have a cancellation policy where I need 24 hours notice if you aren’t going to be able to make the session.  You will be charged the full amount of the session if you give less notice.  My time is important and as a self employed therapist it is my livelihood.  I currently have a waiting list of people who wish to see me, with short notice cancellations it is unlikely I can fill the space in time.