A.Welcome! What can I help you ?
B.I want to buy a dress.
A.What colour do you like best ?
B.White and blue.
A.What about this one?It's the most fashion style this year.You must like it
as well.You are so thin,small size is right.Have a try ,please.
B.No,thanks.It is too short for me . I would like to see the others. This blue dress looks very beautiful.
A.I am so sorry that we only have L-size of this dress.
B.What a pitty!I must go now.
A.Good-bye!