General Approach 101:
Start off with an general opener, "Hi" or "Hi (expanding with conditions around you)."
After you say hi, ask her what her name is.
(you can comment on her name (be funny if you decide to). After she introduces herself to you, you do the same. After you break the ice, have a very brief and interesting conversation. After the conversation, try to get her email....
If she wants to know why......say something ****y and funny or witty....... "Because it'll bring you good luck if you do" *with a sly smile*
(or something like that).
After you get the email.........give her a little more eye contact...and walk away with confidence.
Note: Wait a few days before you email her.
Good Luck
