Hello, How Are You?

I work in a grocery store. I have to greet people hundreds of times a day. There is the classic, "Hello, how are you?", which of course is supposed to be answered with "fine", because we really don't want to know if it isn't.(Although some customers are more than happy to launch into a long narrative of how bad they are, with details. ick)  Or there is the "How's Sara?", which I really want to answer "I don't know, I haven't seen her". It would confuse the hell out of them, but I hate when people use that greeting--it feels like someone talking to a child to me--, and besides, my name isn't Sara. But that's a whole other post. I watch alot of British TV and I've noticed this greeting,"All right?", in quite a few of them. I know if I tried it, I would confuse the hell out of people. But it could be amusing!