If you're not going to game them, what does it matter what you say? Better to let'em know you're up for it, in case they've got a friend. I just assume girls are flirting with me if they ask... it's fun.. and leads to flirting

i.e "Hey, are you single?"

Sasha "Are you chatting me up?" or "That's a rubbish pickup line. you need to work on your game!"

etc etc

then u can still say you're just having fun or whatever....