You want to look nice. Not overly dressed, or looking like you just came from a dumpster. Relax, smile, and use your body language. Now, when I say use your body language, do not go huddle in a corner by yourself, so that cute girl/guy will come give you empathy. Instead, give them a nice flashy smile, or if you are braver, a tiny wink. Show them that you are comfortable and confident. Otherwise, you are not going to get anywhere!