I am sorry sir, smoking is prohibited is this area.
Oh! I didn't know that.
We have a sign here, it says: 'no smoking please.'
I see, I am sorry, I didn't see that.
It's O.K. just extinguish your cigarette please.
Sure, sorry about that.
Thank you for your cooperation.
谢谢
參考答案:很抱歉，先生，这里禁止吸烟
哦。我原先不知道。
我们这儿有个标记，上面写着：“请勿吸烟”
我知道了。我很抱歉，我没注意到。
没关系。现在就请你把烟灭了吧。
好的，很抱歉。
谢谢你的合作。