Usually for me it's something along the lines of

Me: hey whats up I'm Redditor6512 how're you?

Her: Pretty good. You

Me: same same. So whatcha reading/eating/doing

Her: blah blah

Me: cool cool etc etc.

She usually asks the same thing and stuff like that.

Usually something along those lines and then eventually after 5-10 minutes I'll say something like "Well it was nice talking to you, what's your phone number?" as I give them my phone.

I haven't had it fail on me but I feel I could work on things so I was wondering if you guys have tips or your approach.