When to use appointment in Korean
Korean: 약속[ yak-sok ]

When to use it
약속 means an appointment or a planned meeting at a set time. You use it when you talk about meeting someone, going to a place, or having something scheduled. It is a very common everyday word in Korean.
Example sentences
오늘 오후에 병원 약속이 있어요.
I have a hospital appointment this afternoon.
내일 미용실 약속이 있어요.
I have a hair salon appointment tomorrow.
저는 학교에서 선생님과 약속이 있어요.
I have an appointment with my teacher at school.
공원에서 친구와 세 시에 약속했어요.
I made an appointment to meet my friend at the park at three.
약속 시간은 열 시예요.
The appointment time is ten o’clock.
엄마는 은행에 약속이 있어요.
Mom has an appointment at the bank.