I've also tried typing in what it says on the little mouth/help symbol of the npc, and that didn't work either.
Why are you typing ?
1. Click on the NPC and make sure you see the pick highlight under his/her feet.
2. Right click on the npc and then click on the lips
3. You will see a list of quests. Under each bold faced quest title is a line indicating what you will say to the npc
4. Click the line that you want to say . It will be highlighted when you click it.
5. press the
Enter Key
You should see your text appear in the NPC / Quest tab