临时会议 [名] temporary meeting; [例句]因为我必须参加一个临时会议，所以不得不取消今天下午和您的约会。 I was asked to attend an unscheduled meeting, so I have to cancel the appointment for this afternoon.
Sorry，there is an important interim meeting today, the interview has to be deferred for three days. I shall pick you up then; hope you can understand. 【英语牛人团】
The meeting which should be hold at 3:00pm shall be cancelled,and we feel sorry for the inconvinent caused,will let you know once confirmed,thanks.
"I am so sorry that can not meet"