如何用英语表达“不能按时赴约”？

失约.

I'm sorry I can't keep the appointment. 

很抱歉我不能赴约了。

You stood me up, I'm so angry. 

你放了我鸽子，我很生气。

stand sb up

放某人鸽子

I was stuck on the road, so I didn't make it on time. 

我被困在路上了，所以我没能及时赶到。

I'm sorry, but I can't go right now. 

很抱歉，但是我现在去不了。

Why didn't you show up yesterday. 

你昨天怎么没露面？

A: Ross, it's eight now. Why aren't you here yet?

罗斯，现在已经八点了，你为什么还没到？

B: I'm sorry, Jane. I'm still in halfway. The traffic is too heavy, my car is moving like a tortoise. 

对不起，简。我现在还在半路上呢，太堵了，我的车像一个乌龟一样在挪动。

A: Oh, it's weekend. Many people are traveling. Damn it, I forgot that.

今天是周末，出行的人特别多，该死，我忘记这一点了。

B: Jane. I'll probably get to home in forty minutes.

简，我大概可能还要40分钟才能到你家。

A: Everything is late.

黄花菜都凉了。

B: Don't say that. Now the traffic police are clearing up the traffic. I expect it will be cleared in ten minutes. 

别这么说，现在交警已经在疏通车辆了，我预计十分钟后就畅通了。

A: The plans don't catch up with the changes. Who knows what's going on with you?

计划赶不上变化，谁知道你又会遇到什么事？

B: I promise I'll be there by nine o'clock. Please apologize to your parents for me. 

我保证，我会在九点之前赶到那里，请你代我向你父母道歉。

A: Okay, but I'm sure it will definitely make a bad impression of you for them. 

好吧，但是我相信这绝对会让他们对你有一个不好的印象。

B: This is the last thing I want to see. Please, put it in a good word for me. 

这是最不想看到的，拜托了，帮我说说好话。