I can't be there today/at noon.

我今天/中午没法过去。

I can't make it this weekend. 

我这周去不了。

I can't make the date/meeting/appointment. 

我没法赴约/参加会议/赴约。

Why didn't you come/show up?

你为什么没来？

Why did you stand me up?

你为什么放我鸽子？

Why did you blow off our date/ the meeting/the appointment?

你为什么没赴约？/参加会议？/赴约？

You owe me.

你欠我的。

You had better make it up to me. 

你最好补偿我。

Dialogue1:

A: Why didn't you show up yesterday?

昨天你为什么没来？

B: Something came up and I couldn't get away. I'm really sorry. 

有事情我走不开。我很抱歉。

A: Did your phone break too? Why didn't you call?

你的电话也坏了吗？为什么不给我打电话？

Dialogue2:

A: This is the second time this week you stood me up, what's going on?

这是你这周第二次放我鸽子了，发生了什么？

B: Sorry, I'm really sorry, but I've got so much work these days. 

抱歉，真的很抱歉，这几天我的工作很多。

Conversation:

A: Sorry, honey, but I'm not going to be able to make it. Something's come up. 

对不起亲爱的，我没法去了，有事情。

B: What? It's our anniversary. I've been looking forward to this for a long time.

什么？这是我们的周年纪念，我盼望这一天已经很久了 。

A: I know, I know. I promise I'll make it up to you. But something came up here at the office and I'm not going to be able to leave for a while. 

我知道，我知道，我发誓一定会补偿你的。但是公司有事，我这会儿没法离开。

B: Why does this always happen when we have plan? Are you sure you even wanted to go out tonight?

为什么每次我们有安排的时候都会发生事情？你确定你今天晚上想出来吗？

A: Yes, I swear. I was looking forward to it, too. I promise I'll make it up to you this weekend. But I really have to go now. This meeting can't wait. 

当然，我发誓，我也非常期待这一天。我发誓这周末给你补上，但我现在得挂了，会议不等人。

B: Alright, but don't forget you owe me. 

好吧，不过别忘了你欠我的。