How to write farewell messages
A farewell message mixes a little sadness with a lot of good wishes. Say you'll miss them, thank them for something specific, and wish them luck in what comes next. For a colleague, that might be the help they gave or the fun they brought to the office. For a friend moving away, it's a promise to stay in touch.
Keep the focus on them and their new adventure, not on how hard the goodbye is for you. And leave the door open: "Let's still grab lunch" or "I expect photos from your new city" makes a goodbye feel like see-you-later.