What's my play?

[JC21]

So, the other day, I was walking around campus when I spotted an guy I knew back in grade 7 (I'm in University now). We were mild friends then, but we haven't spoken in many years. The guy has changed a bit, seemingly, but from what I've heard, the guy is smart and a bit of a dork. Anyways, I have no real interest in getting reacquinted with this guy. However, he was sitting at a table with 3 girls, presumably girls he knew from high school (cause he isn't the kind of guy who would pick up a bunch of girls). One of them is attractive, and I would not mind meeting her. So, I could go up and talk to the guy (and he knew me well enough to still recognize me), but how would I be able to talk directly to this one girl and get away from the others?