when are you available?
when will be convenient (for you)?
it will be …
I will adjust my schedule accordingly (to yours).
I’m afraid my schedule is a bit tight on …(that day).
I’m afraid my schedule is rather tight on …(that day).
my schedule is full
I fave another appointment at that time.
I will let you know as soon as I have time for you.
I’m terribly sorry but I have to call off the meeting.
I’m terribly sorry but I have to cancel the appointment.
I’m terribly sorry but an urgent business trip came up.
due to … N 理由
because … 理由
I’m afraid I won’t be able to visit(/meet/make it) you on Monday.
can we reschedule it?
could we postpone it?
I’m looking forward to meeting you.
I’m looking forward to seeing you.