So you got a contact, and you have to ask her out, when you do it give the girl a two day option. Like: " Hey, lets drink something wednesday or thursday"

This is good because: A: If you suggest only one day and she is busy, that way you will come out as needy or a person who has nothing to do when suggesting another day. B: You will demonstrate value, as you only have these specific days to go out. C: Its harder for her to make a excuse for more than one day, and if she does you will know almost for sure that she is not interested.

Its working for me! English is not my main language, so if something came out weird, sorry, but I think you guys get the idea!