Reschedule Appointment Letter

Dear [Recipient],

I was wondering if it is possible to reschedule tomorrow’s appointment to another date and time due to an unexpected conflict in my schedule. I’m terribly sorry for this but it’s really beyond my control.

Please confirm if [9 March, 10 AM] is suitable for you.

Thank you for understanding.

Regards

Dear [Recipient],

I would like to reschedule tomorrow’s appointment to [another date and time] due to [some reason]. I apologize for any inconvenience this may cause. Please confirm if the new date and time are fine with you, otherwise I’m open to suggestions.

Thank you very much for understanding.

Best Regards