I wasn't aware of that policy
我不知道那项规定。

be aware of..
意识到...
He was not aware of the mistake he had made.
他没有意识到自己犯的错误。
policy
政策;策略
foreign policy
外交政策
The company has adopted a strict no-smoking policy.
该公司实行了严格的禁烟制度。

A:Madam,I'm afraid you cannot carry those cosmetics onto the plane.
女士，恐怕您不能携带这些化妆品上飞机。
B:Why can't I?
为什么不能？
A:We have a strict policy about liquids.Your bottles of cosmetics exceed the allowed limit for liquids.
我们对液态的物品有严格的规定。您这些化妆品超过了允许携带的液态物品的量。
B:Oh,I'm sorry,I wasn't aware of that policy.
哦，对不起。我不知道那项规定。
A:I'm sorry,but I am going to have to confiscate them now.
很抱歉，我现在得将他们没收了。
B:But I spent so much money on those cosmetics!
但是我花了很多钱买这些化妆品。
A:I'm sorry,madam,but we have these rules for your safety and the safety of other passengers.
很抱歉，女士，但是我们的这些规定是为了您和其他乘客的安全。
B:Ok,I understand.
好的，我理解。
A:I apologize for this inconvenience.Have a good flight.
对于给您造成的很多不便我很抱歉。祝您旅途愉快。
B:It's ok.Thank you.
没事，谢谢。