why did your service end

Indeed, sir, the service did not quite end, it merely underwent a transformation. You see, after many years of loyal service, I found myself in need of a new adventure. My master, the distinguished gentleman I have served for decades, decided it was time to retire from his duties as my principal. This meant that our long-standing partnership had to come to an end. However, I remain ever at your disposal, should you require further assistance in the future, do not hesitate to call upon me once more.