also: ノーショウ
noun
A person who does not arrive for an appointment, reservation, or event without prior notice. Common in travel, hospitality, and business contexts.
ホテルはノーショーが多くて困っている。
The hotel is having trouble with many no-shows.
予約したのにノーショーになると、キャンセル料がかかります。
If you become a no-show despite having a reservation, a cancellation fee will be charged.
Borrowed from English 'no-show'.