急求英语高手遍一段商务英语对话！大三水平。（截止时间明天中午）

John Davidson: Is Mr Zhang Yi in?

Zhang Yi: Speaking ,pls.

Johin Davidson:Hello,this is John from England. I am calling to ask about cotton .Pls give us your best quotation.

Zhang Yi: Thanks for your inquiry.Our best price is $2.5 per kilogram.

Johin Davidson: The price is too high. The quotation we received from other sources are much lower.

Zhang Yi: Then how about your quantity? If you can place big order ,we can give you some discount.

Johin Davidson:I understand.We need about 10 ton.

Zhang Yi: Now we can offer you $2.3 per kilogram FOB qingdao by sea.This is our lowest price.

Johin Davidson:How long is the offer?

Zhang Yi: It's good for a week.

Johin Davidson: Good.But when will you deliver the goods?

Zhang Yi: We have goods in stock.Once you confirm the order ,we will ship promptly.

Johin Davidson: Ok ,but we need to check again with our headq