Hey tweeby,
Ahh this is some of my favourate past times.. flirting with the assistants at shops... so innocent.
A good thing to have done would have been to give her our number so she could ring you when ur shoes are in
..but none the less just be fun and flirty, keep her on her toes, remember shes trying to sell you shoes.. she is the one that's going to have to jump through your hoops in order to do this
Then after qualifying her to the point of you finally accepting her, just add that when u first met her u were undecided about her and her creepy shoe selling techniques but now that you've got to know her she would be the kind of person you'd hang out with in real life. This is when you then get her number and after you do, spend another 5-10 minutes flirting with her, so she feels good about giving you that information rather than used.
most of all, have fun