Any way to make a fake player able to chat?

So I'm trying to make a bot that you can speak to in chat and I really do not want to make a custom chat GUI just to do it. I'm wondering if there is any way to create chat messages from a script that will display like so in the chat:

? ChattyBot: <Message goes here>

Like I said I'd like to avoid creating my own chat GUI or even using someone else's custom chat GUI because I dislike losing focus on the input box when you die.