Patient cancelled a few hours before appt.

Such a frustrating day. I called my patient to remind them of their appt. and they called the Dental Clinic at 4 and canceled on me! Luckily my patient I had scheduled for the following week was able to come in. Why can't patients be more responsible?? They want me to call them back and reschedule them, but I'm a little hesitant because I don't want the same thing to happen again. So the patient that did come in was a hard 1B, it was really good practice, but I seriously missed so many spots because he had so much subgingival calculus.