Tell him who you are

Look I'm just a boy who's costume turned out not to be the one in the box. Okay?"

"Take it easy; are you serious about being a guy?" He asks.

"Yes."

"Well in that case, I'm off to a party as well, this one as a top prize of five hundred dollars, I'll split if with you if either of us wins. What do you say?"

"But you're not in a costume?"

"Well, the party doesn't start for another couple of hours, I was just on my way home to change, when I saw you, I thought I would take a chance and see if you wanted to come along, couples always do better at these type of things. So are you coming along?"