hello,
i've been practicing pua techniques for a few months now and this seems to be a sticking point of mine: after getting the girls' info how do i set up a date? here's my story:
i met a hired gun 7.5 (an international student) at a cafe last week and asked if she wanted to be my conversational partner. she agreed and gave me her phone number
2 days later i called her and left a generic message. no reply. 2 more days later i call, but the phone number is out of service

wtf? i think fake number, oh well.
today i go to the cafe and i see her working there. she tells me she got my message but her phone got discontinued. i act like it's no big deal, saying i've been busy anyway. she asks if we should meet after finals (which is two weeks from now); i say i can't i wont be in town. so i offer to meet her two days from now, but she declines b/c she says she's busy.
i take a seat in the cafe and read a bit. 5 minutes later she comes up to me and says "i'm leaving, but let me give u my email address". i take it and she leaves
now my question is, how do i set up the next date? should i try to set it up via email, or should i just go back to the cafe and ask her to hang out after she gets off work? i read somewhere that setting up meetings via voicemail was bad, so it seems like email might be a bad idea as well. personally i feel that if i ask her out on the spot it will work because it's spontaneous.
what do u guys think?