用英文写一篇两个人买东西讨价还价的对话

-hello, how much are these apples?
-1dollor per kilogram.
-oh, that's too expensive, can you give me a better price?
-Sir, it is not expensive at all.
-OK, I will buy 3kg, so you have to sell them to me at a lower price. What about 2 dollors for 3kg?
-No, sir, I will lose money in that case. 2.5 dollors at least.
-Well then, I will take them. Here is the money.
-Thanks Sir.

can i help you?
yes,i am looking for a shirt.
how about this one?
oh yes,i like it.how much is it?
100 yuan.
can you give me a discount?
ok,let's make it 90 yuan.
ok,i'll have it.