Excuse me, I can't get by.
劳驾，请让开点路。
Excuse me, you're wanted on the phone.
对不起，有你的电话。
If you'll excuse me, I must go and mingle.
对不起，我得去和其他客人聊聊。
Now if you'll excuse me, I'm a very busy man.
如果可以，我先行一步了。我很忙。
Excuse me, is this your seat?
对不起，这是您的座位吗？