Ok I tried i again :). Had a fun word battle with the teacher tomato :D. For some reason while the tomato is thinking the old text is typed in again. Looks like a bug. Then it would be very convenient if the test I just typed is deleted as soon as I press speak. Otherwise I need to delete it first, which stops a bit the flow of the conversation.
Anyway, really fun idea :). I will come back the next time I need someone to talk to :D.