形容词
中文翻译：未预订的
同义词：
['unscheduled', 'unplanned']
例句：
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1.The flight was unbooked, so we had to wait for a new one.
航班未预订，所以我们不得不等待另一班。
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2.The hotel rooms were unbooked, so we had to book them in advance.
酒店房间未预订，所以我们需要提前预订。
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3.The restaurant was full, so we had to book a table in advance.
餐厅已满，所以我们需要提前预订一张桌子。