Obviously.
What strangers see
One handwritten word on the chest, where a name badge would go. A little smug. Charming.
What you know
The reply to At your service. Worn by the person who receives the service and has never once doubted they deserve it.
Not every answer needs to be long. This one is placed where a staff badge would sit, because the joke is about who's really in charge of the room.
Pair it with At your service.