May 10, 2021
[City], [State] [Zip Code]
Subject: Meeting Rescheduled
Unfortunately, I need to reschedule the meeting that we had planned for [Date] at [Time]. I apologize for any inconvenience that this may cause you. The reason that we need to change when we are meeting is that [ .... insert reason ... ].
The meeting has been changed to:
I am looking forward to meeting with you. I hope that this new time works with your schedule. Please, let me know.