(Thanks for Recommendation)
My dear ————,
Because of your influence and kindly interest, I have secured the position with ———— and hasten to thank you for the excellent recommendation which you gave me and to assure you that I shall give diligence to my new work.
Respectfully yours,
(Regrets)
My dear ————,
I regret exceedingly that I failed to meet you as we had appointed. When I see you I will explain why I could not come. In the meantime consider me as ever,
Your Friend,
My dear ————,
Please pardon my not appearing at our proposed meeting, for I was unavoidably detained. I trust I shall not be put in such a plight again. I cannot quite explain, but send my sincere apologies.