I'm sorry, but I have to cancel out luncheon appointment. 真抱歉，不过我不得不取消我们午餐的约会。 I'm sorry to hear that. 真遗憾。
I have pressing business to attend to. 我有紧急的事情要处理。 No problem. we'll make it later in the month. 没关系，这个月改天再说吧。
