1. A method for providing voice interaction in a vehicle, the method comprising the acts of: receiving, by a voice interface server, a voice-based query from a user in the vehicle; determining, by the voice interface server, an emotional state for the user based on a detected valence and arousal level associated with the voice-based query; deriving, by the voice interface server, a text-based query from the voice-based query; searching, by the voice interface server using the text-based query, a help database for at least one response to the voice-based query; and providing, by a voice interface server, the at least one response to the user in the form of voice-based assistance in accordance with the emotional state of the user.