Sample 1:
I am deeply embarrassed for missing our meeting on May 10; please accept my apologies. As you understand, I was unable to attend because my flight was delayed five hours due to unfavorable weather in San Francisco. I am pleased, however, that my colleagues were able to present our proposal to you. I have spoken with them, and rest assured that I am fully up-to-date as to the discussion and concerns raised. As I understand, you would like detailed schematics of our Magnaflux compressor. Accordingly, allow me to arrange for my engineers to forward this to you immediately.
I will be getting in touch with you by the end of this week to discuss any other concerns you may have. Also, I would also like to meet with you regarding the possible use of our Magnaflux compressor in your other manufacturing sites; how is June 20?
source: sampleletters.com