To make an appointment or reservation (e.g., for a restaurant, doctor, or ticket) — to secure a date/time or place in advance.
明日の夜、レストランの予約を取ったよ。
I made a reservation at the restaurant for tomorrow night.
病院は予約を取らないと長く待たされることが多い。
If you don't make an appointment at the clinic, you often have to wait a long time.
ネットで簡単にチケットの予約を取ることができる。
You can easily reserve tickets online.
すみません、髪のカットの予約を取りたいのですが。
Excuse me, I'd like to make an appointment for a haircut.