求一段英语对话,有关购物的,要有还价过程,大学英语水平,一分半种左右

s:welcome.can i help you?
b:yes,i want to buy a shirt.
s:these are the latest fashion.what size do you take?
b:--.which color do you think fits me well?
s:what about blue?
b:no,it's too dark.i like the pink one better.
s:OK,try it on.looks nice on you.
b:yes,i agree with you.how much does it cost?
s:$-.
b:oh,that's a bit more than i wanted to pay.
s:but it's the best offer in town.
b:may i have a discount?let's say,10% off,OK?
s:i can only give you 5% off.It's extremely cheap.
b:OK,i take it.may i pay by card?my cash is not enough.
s:sure.