when conversation starts to dry out I'll usually take a bit of a break and then come back in with something fresh. 9 times out of 10 I'll come back with something like, sorry I haven't gotten back to you, been busy, and you've been boring me to death
Then immediately transition into something that makes them qualify themselves. For example. Ok, so your good looking and alot of fun... but what makes you so cool.
My rules is ABF - always be flirting. Never talk demographics (where ya from, what do you do, blah blah blah) it's boring. I ask stuff like, what kind of adventures do you like to have.
Hope this helps. Remember to neg and make them qualify themselves to you with the questions you ask.