店员：what can i do for you?
顾客：I'd like to buy a piece of shirts
店员：this way please,what color would you like?
顾客：red or blue.
店员：what size do you want?
客户：i usually wear a size 42
店员：ok,you can try on the blue one.
客户：it fits me very well.how much?
店员：120 Chinese Yuan.
客户：here is 200 Chinese Yuan
店员：give you the change.
客户：thanks,bye!
店员：you are welcome!