What about this approach?

I like it when a guy approach me because it shows that he really want to get to know me. I would be cautious too, same thing like all the other girl said. No,i wouldn't find the way to leave if I think the guy is funny and he is sincere about his approached.

I would be kind of flattered, but still cautious like the other girl said lol, because it makes you wonder if they do that a lot.
It would be a pretty nice approach I think. :]

I really think he does this to everyone so be careful those lines sound like he has used them many times before. I would let him sit but I would play his game as well play hard to get because he sound like a smooth guy full of you know what. Unless you are the one trying to do this and you are really interested in this one person I just think you have to make sure this person flirts back somehow or notices you.

well I guess that depends on how attractive the girl finds the boy, whether she is involved in a serious, full fledged relationship and is happy or not, the confidence of the guy who approaches her, the general perception of men the girl has, etc. so I guess there is no one size that fits all