I have the same policy as you, and it works really good because its rare that anyone here is sick because of this. But I do have a policy that if they dont' call I will charge you my rate, this is why I don't call looking for anyone, I just now charge them.
Good idea... I may add that into my policies.
I finally heard after 9am. But that's way to late. At that point I assume they're not coming anyways.