September 4th, 2018
Dear “Boss’ Name”
I’d like to begin this letter by saying thank you for offering me the position of case manager at “company name” I will no longer be able to continue employment and my last day will be October 4th, 2018. I sincerely regret this turn of events. I am grateful to you for your belief in my potential and wish I could have stayed on to prove us both right. Thank you for your understanding.
I wish you and “company name” success in the future.