卖家：Hello,what can I do for you?我能为你做些什么吗?/需要我的帮忙吗?
顾客：Hi,i'd like to buy a pair of shoes.我想买一双鞋子.
卖家：What color do you want?你想要什么颜色的呢?
顾客：I like black.我喜欢黑色的.
卖家：OK,we have many kinds of shoes in black.By the way,what size would you like?嗯,我们有很多黑色的鞋子,顺便问一下,你需要多大码的呢?
顾客：I’d like size 35,thanks.我需要35码的,
卖家:OK,here you are.嗯,好,给你.
顾客：How much is it?多少钱呢?
卖家：You need to pay 85 yuan .你需要付85块钱.
顾客：OK,I will take it.嗯,好,我将买下它.