Pt. Cancellations

I have had a frusterating afternoon. I had a pt. lined up and had called the night before to confirm (remind) an appointment for the next afternoon and the pt. said okay. Then ten minutes after the pt. was suppose to be here I called to see if the pt. was coming and again the pt. told me they'd be here. I called back after thrity minutes and the pt. said they would not be able to make it. So I spent thirty minutes finding another patient. The pt. that I had just called to come in last minute no showed too. I just don't understand why people can't just tell the truth that they can't make it in the first place. It's so frusterating. So I haven't really been able to do anything this afternoon. My instruments are sharp though.