Work train.

Somewhere in an office. A toy train that travels throughout the entire building. There are glass tunnels in every office so that all employees get a chance to see it. An app that allows employees to deliver a tiny package once a week to brighten someone's day. They set the destination via the app and place the package on the train. When it arrives at the destination, the glass tunnel opens and the tiny package is pushed from the cargo hold down a tiny chute. This way, even if the person is out the package is still delivered. The app makes sure that everyone gets a package before allowing someone to receive a second one. Maybe it also assigns you a person.