you introduce yourself 1st of all. "Hi, can I sit next to you?" "sure" "OKay, thanks. My name is (insert name)." Put your hand out to shake it. If you are a smooth and charming guy and you can do it right way, instead of just shaking her hand, politely kiss it. But if are a shy guy, that is creepy. lol. But a gentle manly kiss on the hand speaks volumes. Your intitions will come clear, so u wont be friendzoned, but it shows you aren't just a pig who want to get in her pants. Trust me, it will work, I should know.