1234 Archer Road
Gainesville, Fl 32607,
[Subject: Normally bold, summarizes the intention of the letter] -Optional-
Dear Justin Holloway,
Many thanks for covering my shifts this last week. I know that it has meant doing double what you would normally do. I would have missed out on the family vacation if you hadn’t agreed to do this for me. Whenever you need time off let me know and I will gladly cover your shifts for you.