When I first started I fell into the trap of thinking that a guy who was nice and complimentary on the phone, who spent ages discussing his fantasy about meeting you for an overnight/weekend and required several hours of texts/calls was to be relied on because he would definitely book... Any day now...
Now I have my tier system.
Tier 1: calls, greets me by name, says his name and he would like to book for x day/time for y hours, for my GFE/Alt service. These guys will 99% turn up and be polite and pleasant.
Tier 2: calls on the day, asks my availability, picks a time and duration but maybe hasn't fully read my profile. 50% of these fail screening.
Tier 3: calls on the day and wants to come right now. 75% fail screening.
Tier 4: sends texts saying "u free", "?", "Hi baby", or calls and says "Give me your postcode" as their first sentence. None of these pass screening.
Tier 5: sends long, detailed texts and emails, or phone calls, describing everything they want to do to you/done to them. Frequently books a date several weeks in advance then cancels a couple of days before as "my travel plans have changed". These guys NEVER come through in my experience, but the temptation is to keep engaging with then because they come across as so polite and pleasant. I have to remind myself that someone being good on the phone doesn't pay my bills, especially if they're tying up my phone line when genuine clients are trying to get through!