theres a whole bunch of ways to do it but i personally like this: start walking away but then turn arouand and say something like "ya know im gonna regret this if i dont do it but here im gonna give you my number that way if you ever feel like continuing this conversation call me" then as your saying that write your number down on a piece of paper hand it to her and walk away confident

Naw fuck that. Too easy to get turned down. You should have taken her silence as a yes and handed her your phone to put her number down.

Wat Slip n Slide said would definitely work, and even your other cocky-funny response sounds ok. What you said, actually, was probably the worst thing to say, though. It worked, so don't worry about it (if it works, no problem, right? ), but next time, you want to come across as being indifferent to whether you got the number or not. A simple "or not" with a shrug will throw her off. Her pause seemed to say to me that she was afraid you were a little forward. No problem there. Her hesitance was, in a way, a good thing, as she was having to decide what your intentions were, and how far she wanted to take a "continuation of a conversation". Having a piece of paper and pen, though, would help a lot in these situations, being able to just hand her both after your nonchalant "or not", affirms that you can take it or leave it, but you are definitely interested.

I always keep a fold-up-pen in my back pocket, and in this situation, using your receipt would make this seem an ordinary, but spontaneous thing. i prefer to have the number on a sheet of paper, as opposed to just in my phone. Either way, though, Congratulations!