A：What can I do for you？
B：I want to buy a dress for myself．
A：OK．（71） ______
B：Size M．And my favourite colour is yellow．（72） ______
A：Sorry．（73） ______ But there is one in L．
B：Let me try it on．Oh，it is a little long for me．
A：（74） ______
B：OK．How long do I need to wait？
A：About a week．
（75） ______ Everything will be half price．
B：That sounds good．

A．And then we will have a big sale． B．What size do you often wear？ C．If you really need the dress in M，you have to wait for several days． D．How much is the yellow dress？ E．We don't have any yellow dresses in M． F．Please help me find a yellow one． G What can I do for you？