January 18, 2021
[City], [State] [Zip Code]
Subject: Meeting Cancelled
I am sorry to tell you that I need to cancel the meeting scheduled for [Date] at [Time]. I understand that this meeting was important to both of us, but it has been cancelled because [ ... insert reason ... ].
Currently, I am unable to schedule a new time for this meeting. I will keep you posted when there is another time that we can meet.
Thank you for your understanding.