翻译为英语：我们准时到达机场，不料却被告知我们的航班取消了。

We arrived at the airport on time,however,unexpectedly,we were informed that our flight is cancelled
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We arrived at the airport on time,however,unexpectedly,we were informed that our flight is cancelled

Unfortunately, we were told that the flight was cancelled when arriving in time.

We had arrived the airport when we were told that the flight was cancelled.