I've learnt when you asked a girl to hang out, if shes interested in you she'll usually agree to meet up before you tell her what you're going to do. If she says "to do what?" then most likely she ain't feeling you.

How would you talk to her about meeting up without making it as if you're really trying? My reply to "to do what?" was "I'm free Saturday, Saturday cool? I'll call you before I pick you up" And now waiting on a reply. What would you say so I have some more ways to handle it in future.