Listen, I have found that if you call an AMP and ask for a particular girl ahead of time, they will almost always say she is there even if she is not. When you get there, either another girl will say she is "so and so," or they will say "so and so" had to leave for emergency. They figure once you are there you will accept someone else. When you call, do not ask "is so and so there?" Instead, ask "who is working right now?" They will not know who you are seeking, so you will get a straight answer.