Hey, check out the chat box I added to my game.
http://www.mythstrott.webs.com/mythstrott.html
The chat box is in the bottom-left corner. You can type your message in the text area and then press “enter” to confirm.
Also, something I added to my other scripts is for the game to automatically “chat” with you in that same dialogue when you cut trees and make campfires. It tells you what you’re doing. To try this out, walk (with arrow keys) next to the tree and click on it (or click on your hatchet in the inventory). Then make a campfire by clicking on the logs in your inventory.
If you want to know how I added the ability for the game to submit its own dialogue, just ask.
You can see the script for the chat here:
http://forum.unity3d.com/viewtopic.php?p=385654#385654