She is not able to take your call at the moment.

她现在没办法接你的电话。

Wrong number.

打错电话了。

I'll call you again later, OK?

我以后再打给你，好吗？

All right. Please hold two orchestra seats for us.

好，请帮我们保留两张前排的座位。

I'm calling to know if it would be at all possible to cancel our reservation.

我打电话想知道我们的预约是否有可能取消。

Yes. I wonder if you can send up some of boiling water for me.

是的，你可以送点开水上来吗？