28. The apparatus as recited in claim 1 wherein the logic that provides the personality comprises selecting a prompt based on a user's experience with using the voice user interface during a current session and across sessions.
28. The apparatus as recited in claim 1 wherein the logic that provides the personality comprises selecting a prompt based on a user's experience with using the voice user interface during a current session and across sessions. 30. The apparatus as recited in claim 28 wherein the logic that provides the personality comprises selecting a longer help prompt if the user's input indicates a problem with increasing frequency during the current session and across sessions.