Uhh...Perhaps check what the player chats, and if it's what you want them to say, change their gani?
It's only 3 lines of code (Depending on your formatting preferences), but I am not going to post it, because:
1) It's a 'full script.'
2) This is basic, and you need to figure it out yourself
HoudiniMan's right; commands.rtf is every newbie scripter's best friend.