Yuffie and bartending might not go too well -sure she knew the drinks, she'd hung around Tifa's long enough to know how to pour them too, but she wasn't always coordinated and she tended to maybe get a little underfoot sometimes. So no, she didn't think she'd be the best behind the bar.
"I'm only twenty, so I can't drink yet, but I don't try!" It seemed important to point out that she had no fake ID and no intention to attempt to drink. Waitressing would be fine for her! Tips usually made up wages and stuff, right? "I can totally do that, I don't mind!" And hey, there were frat boys on college campus that liked to try to slap an ass, at least here there were people who would kick them out.
Sore thumb; that was exactly how Yuffie looked right then, but hey, she wasn't entirely sure she'd get a job at this place when she first came. "I don't mind, give me an excuse to go shopping!" And who didn't like shopping. She'd just need to recruit a few different people to help her shop this time. "Really? Okay! I totally do, thanks so much, that's great!" Job!!! Hell yeah, she was a good interviewee!