You should read this thread - gives you a view from the other side... https://www.companyofmen.org/threads/dos-and-donts.150718/
You are the secret sauce - you will develop a ‘gut feel’ for guys. The tone of the message will tell you a lot. Also how they respond when you try to iron out the necessary details (time, date, location and how they desire to spend the time). I would (and do) walk away if the provider is not responsive - on the other hand I tend to be rather ‘business like’ when I text and won’t waste a provider’s time.
In this day and age I find it surprising that a client is not willing to share a number; the ability to coordinate basic logistics via text is a must. Did you lose out? Maybe. More likely you dodged a bullet. If the guy is high maintenance... I dont have a Rentmen profile - but I will tell you when I found your profile on RM.
Not an escort, but a quick and polite discourse is needed before I agree to meet. Networking with other escorts can be dicey. The may be helpful (like @VictorPowers) or not. Most guys value their privacy and wont like the idea that you are ‘gossiping’ about them behind their back. Tread careful, most guys will consider it unprofessional to talk about your clients.
For me a polite and timely response via text message is necessary. Never show frustration or anger - even if you have a bad day with a lot of cancellations. Decline politely if you don’t have time or it doesn’t feel right. If you want to build a book of business (repeat clients) after care is important. You may want to talk about some of this offline with a pro that has been in the game for a while. ?