予約をキャンセル

cancel a reservation

→ 予約
phrase Rare #40,499
cancel a reservation 予約 means “reservation,” and キャンセル is the loanword “cancel.” Often followed by する or its conjugated forms, such as 予約をキャンセルしたい (“want to cancel a reservation”).
JA: ホテルの予約をキャンセルしたいです。
EN: I want to cancel my hotel reservation.

予約をキャンセルできますか

Can I cancel my reservation?

予約をキャンセルしなきゃ

I have to cancel the reservation.

予約をキャンセルしたいんですが

I’d like to cancel my reservation.