急求一段两个人的英文小对话，大概三分钟。

a; what can i do for you?

b;i am looking for a sweater for myself,u know it is my birthday today

a;wow,happy birthday to u

b thanks a lot

a;what kind of sweater r u looking for? we have the woollen ones and the cotton ones

b;oh i'd like the cotton ones

a;what color do u prefer,we have yellow ,blue ,red black and so on

b;give me the black one

a what sizi do u wear

b size m

a wow it fits u so well

b ok i will take this one,how much does it cost

a it is 120 yuan

b ok  i will take it,here is the money

a may i pack it up for u

b thank u so much

a my pleasure