A : I'm sorry, but we're behind schedule.
B : Then when should I check back with you?
그럼 언제 다시 찾아 뵐까요?
A : Sometime next week will be fine.
B : Should I call first?
전화를 먼저 드릴까요?
ahead of schedule 예정보다 빨리
as schedule, on schedule 원래 예정대로
The train from Busan is behind schedule