Just fill the space with whatever the fuck you want. How about some little cold reads?
"You seem like you're up to no good. Are you spying on somebody or something? Is it him?" *points to random guy*
"You seem quite smart. Did you go to university?"
"You seem bored. How about I punch you square in the fucking throat, bitch?"
don't do the last one, Redstar.
Honestly repetition is the mother of skill. Just stick at it. Also, learn how to appreciate an awkward silence. She's frantically trying to figure out something to say too - that's good for you