I wrote him a letter. I got a reply from his assistants, basically saying he was too busy. He did say, not to send any signals to extraterrestrial civilizations. We would be doomed if it wasn't for the Arecibo message. I really like Cambridge, very nice area. I would love to retire in that area of the world. Farewell Mr Hawking.

https://en.wikipedia.org/wiki/Arecibo_message