怎么没有关于购物的英语长对话，两三分钟的

Mother: Tom, here I found a green sweater ,I think it will nice fit on you and cheap as well.
Tom: Ok, let me have a look. I like the color but don't like the design, the zip around pocket looks very strange.
Don't worry, we can try to find a different one, here are plenty of sweaters! said the father.
We'd better to ask the assistant for help.said the mother. But after a short while, mother shouted to Tom, I have found a very nice sweater, you will definitly like it.
This will make my little Tom more handsome ! said the father.
Tom walked quickly and got excited himself, Wow, I am surely like it, the color is even better than the first one and here is no strange design, but the size is a little small for me.
Do you have a L size for this sweater? asked the mother to the shop assistant.
Yes,Madam, here is the L size sweater. Will you have it ? asked the assistant.
Yes, how much is it? asked the father.
40 pounds after discount. answered the assistant.
Oh, my god! I couldn't find my wallet! I must have left it in my other jacket at home. shouted the father.
And I have just payed for our lunch at KFC so I don't have enough money to buy it.said the mother with worried complexion.
Oh, What a pity! Tom said sadly.