I booked an appointment tonight with a provider at a time we agreed on.
I texted her letting her know I was on my way and even when I was near by.
When I arrived I called her and waited and no response.  
My first call went straight to the voice mail. She has a google number.
Later when I called, her phone would ring but this time she changed the settings to busy so it would ring and the recorded voice would say "she is busy leave a message"
I waited only 10 minutes and left after a couple of more calls.

. . . on how hot she is.

....which by definition is being stood up.  

Interesting ... For the last part of that equation, I use 2 x the square root of pi. I guess I am not quite as patient.

Maybe she's a lousy business woman, maybe she's rude and ignorant, maybe she overbooked and was seeing another client, maybe she doesn't like you, maybe she was sick and asleep, maybe someone close to her died and she just didn't want to deal with you, maybe friends or relatives unexpectedly showed up and she just couldn't get away, maybe she has a drunk, scumbag SO who decided to beat the hell out of her, and she didn't think you'd get turned on by the blackened eyes, busted lip, and missing teeth, maybe she was drunk or high and simply forgot......... The list can go on and on. Bottom line: you're participating in an illegal enterprise that is unregulated, and where you have no rights or recourse as a consumer. The only protection you have is solid research and the exercise of common sense. You apparently had a less than satisfactory session the first time you met this woman, but you chose to see her again. Who's ultimately responsible for your latest disappointment?

If you're paying premium $ then you should expect premium service.

If they're just ignoring you then leave. Its  not proper etiquette and unprofessional.

TL;DR : Strictly speaking, until you have paid or until company is provided, nothing from either side should be expected. The responsible thing to do for both sides is to call/text/email & let them know that plans were inconvenienced and that the hope remains to make up for that lost time.

...it takes away from the entire experience. This hobby is supposed to be stress free fun but a lot of the local women always have some excuse why they are late and can't show.

I shouldn't be going to see her to begin with.

So there is a tangible cost to a NCNS, and an even bigger one if one party or the other has laid out money in anticipation of a meeting, like booking a hotel room especially for the meeting.

I believe that "life happens" but unless his/her phone has been lost/stolen/destroyed or one of the parties is incapacitated I don't believe there is any legitimate excuse for not letting the other party know that there is a problem. NCNS is the ultimate in disrespect IMO

one flakes...onto the next one.  

Im not sure if you have an SO and an unexplained extra cell phone.  

There is always a way to get a message if you actually give a shit, except of course for the scenarios I listed.

I am forced to miss, delay, cancel appointments all the time, in both real life and here. I NEVER just fail to show up, it is one of the rudest things I can think of, If I were to get into a car accident and wake up in the hospital the very first thing I would do would be to contact each and every person that was expecting me.

Cancelling an appointment is forgivable, simply blowing one off without calling is not. I don't get "negative" I simply don't give that person a second chance to stand me up, and in the case of the hobby, I will make sure that others know about her shoddy behavior, and I certainly understand that the women should expect the same respect.

....a credit of sorts, should I have to cancel a date.  I havenever been a NCNS.

Thank you all for your comments.  

Maya was once my ATF, tip after she stood me up on three consecutive occasions. And she still had the nerve to text me every time she cam into town!