Bad Luck!

For 3 weeks in a row... my afternoon pt have cancelled last minute... not only that... these are my down to earth class 3 pt's.  I have no ideas what to do at this situation.  I make my appts 3 weeks in advance, and give them weekly reminders and day before reminders.  Luckly, I have good mornings b/c I see 2 pts with a classificaton of 2 or 5.  I only have 5 quads total of class 3 and 4, and I am really worried!  Does anyone have advice for me??? My next goal is to see class 3 and 4's, but I really need help with that!