Ma’am,
I hope this message finds you well, I’m sad to hear of your resignation. I’m going to miss you, and I hope you enjoyed your time in CI. You were a great member of R&D command, and I want to let you know that you’ll always be welcome back in CI. I apologize for the formality of this message, but as this is one of the last times I get to send you a formal message I must keep it as such. I will finish by saying giving you a piece of advice that I hold dear, do what you want to do and look forward earnestly to the future.
Your humble servant,
October
Is very sad