Referring to your inquiry letter dated 29th September, we are offering you the following subject to our final confirmation.
关于贵方9月29日的询价信,我方就如下产品报价,以我方最后确认为准。
At first I thought I'd done the right thing, but I soon realized that I'd made a mistake.
开始我以为我做对了,但是很快就发现自己犯了个错误。