惯用单句
你看我们把约会推到9:30方便吗？
Do you think it's convenient to postpone the appointment till 9:30?

我们把约会推到下个星期天可以吗？
Is it okay if we postpone the appointment till next Sunday?

我恐怕得晚一点，有很多事要处理。
I'm afraid I'll be a bit late. So many things to deal with.

很抱歉，今天不能赴约。
I'm sorry I can't keep the appointment with you today.

我想改下见面时间，比如改到周日，你介意吗？
Do you mind if I change it to another time, say, Sunday?

换个时间和地点行吗？
Can we change the time and place?

我们可以晚点见面吗？我不太舒服
Can we make it a little later? I feel under the weather.

能把见面改到明天吗？
Can we put it off to the next day?

我们提前一小时见号吗？
Can we meet an hour earlier?

很抱歉告诉你我们必须取消午餐约会。
I'm sorry to tell you that I have to cancel the lunch appointment with you.

能把见面地点由肯德基换成麦当劳吗？
Can we meet at McDonald's instead of KFC?
情景对话
Emma:Hello,Kevin.I hate to do this, but I have to cancel our appointment.

Kevin:Oh, no!Why?I was looking forward to seeing you at my new place.

Emma:Yeah,I really wanted to come,too. But something unexpected in shanghai have come up. I have to fly out for a few days,but I'll be back soon.

Kevin:No problem.Call me when you get back.

Emma:I shoud have some free time next week. Say, next Wednesday evening?

Kevin:That's good for me, but do you think you'll be back by then? I'd really like to see you.

Emma:Yeah, I'm expecting to come back on Tuesday.

Kevin:Great!That's settled then

Emma:OK.