一般人会问:Anything I can help you? or Are you OK?
你可以回答: I am fine.
如果你已经和人谈价格了,你又不想买了,可以说:Let me think about it. or Let me consider about it.
Sorry, I think I might just keep on looking
对不起,我想我还得再看看
Thanks,I think I'll shop around.
谢谢!我想我还是再看看.
可以说,(thanks,) I'm just looking around.