Also, although flirting is fun, be careful not to get a name for yourself.
There's a guy in the police (who I work closely with) who is ntorious for constantly texting and flirting with every girl in our office, and the rest of the building come to think of it. Now, the girls make sure that he cannot get hold of their number because it doesn't exactly make you feel special or flattered when you know he is asking you out and your mate has just turned him down!! the circumstances are slightly different I know, but make sure you are going out with these girs because you actually want to because they are nice girls, not because you want to build your ego. This guy is married so it makes it doubly worse.
Sorry if that sounded harsh, I don't mean it to just, basically, if want to meet iwht a nice girl then go for it, but don't feel you have to and, like i said before, let the girl know where she stands. And if it doesn't work out and you don't want to meet her again then just give her a text to say so.