Just looking for some opinions on approaching customers while on the job. I see questions all the time about asking women out from the workplace, but mine in particular is about customers.

I work part-time at a dining hall doing clerical work but I'm often out and about in the dining rooms seeing women all day. I'm not seeking to approach every single girl, but rather the ones that catch my attention and reciprocate ioi's.

There is this one girl in particular I see fairly regularly that I'd like to approach, but I have little idea how to go about it fearing it would seem unnatural.

TLDR: I work at dining hall and would like to know how and if I should approach while on the job.