Dear Mike,  You are a much loved and missed client, I enjoy my time with you every time, you are always so happy, to be made happy, and a sincerely nice human being.  I hope you are recouperating well and know that you are in my thoughts, I miss you.  You are one of a kind.  Love, and good health to you in the New Year, and every year, Love Kristi

My own S.O. isn't even that considerate of me!