Guys...
These things happen. Some people make a comment such as "she could just said she was uncomfortable". Face it, most won't do it.
If there is one thing I know about women is that most of them hate confrontations. They rather not answer the phone than answer, say she won't do it and hear some guy lose his temper on her.
Understand, this is their body. They can choose not to rent it to any of us anytime they chose. We should take the "message": I interpret radio silence means "I changed my mind, can't see you".
Anything, and I mean ANYTHING can make her uncomfortable and she has the right to change her mind. Yes, would be better if she communicates back that she won't see you, but you should take the clue and move on.
Have your big head do the thinking.
Providers are people. YOUNG people. We want them to behave like entrepreneurs, some do, some don't. But most are young girls taking big risks for our pleasure.
Let's be more understanding....
Peace.