When they eventually contacted me after the no show/no call, I'd say it was fine, I had plenty to keep me busy anyway (not a lie), and that I filed an extension for them so I'd let them know after tax season when we could get together. Lots of silence on the other end of the phone followed by a feeble OK, thank you.

 I'd see where I could fit them in and call them a few days later, tell them I had a surprise cancellation, and ask if they were available. They were always available, and there was never a problem with no show again. We have to find our entertainment where we can during tax season. 🙂