I sit behind you
Starting any conversation like this with a stranger is just not the way to go. We do not know how many times we have to say it but just be normal and avoid stuff like this. People will respond to you if you do not act like a total creep toward them.
You do not need to overhear two people exchanging information and then use that as an opportunity to get a girl’s number. Young men are really in crisis from the looks of this list, someone needs to teach them social norms before it’s too late. But it seems like this guy was not interested in getting to know the girl regardless.