hey man,
i think the key to A3 is qualification. your showing interest but only once she has earned it. For example try an adaption of Mystery's Bait-Hook-Reel-Release method:
PUA: "Hey... are you Swedish?" (Bait)
HER: "Yes... why?" (Hook)
PUA: "Oh my god... I'm a SUCKER for Swedish girls..." (Reel)
PUA: "I can't even talk to you anymore..." (Release)
Or this line.. "Hey, at first you seemed kind of dull... but now that I've talked to you a bit more, you're pretty fun." I love this line it works wonders
also A3 is a great time to run the "what elese have you got going for you besides your looks routine. once she answers be really impressed, and yeh as freelife said throw in some positive bodylanguage etc..
hope this helps?
cheers