Can I help you ?   I want to buy a hat .   Come here , please .   Is this one fit for you ? It is nice .   I don't like the style .   How about this one ?   Black is not my favorite colour .   You must like this pink one , don't you ?   It's pretty . How much is it ?   Fifty yuan .   It's too expensive . Can you come down a little ?   How about forty-five ?   I'll buy it if forty .   OK . 