1. An automated voice response system comprising: a voice response unit for recognizing user speech and providing spoken responses to such speech; a dialog history log for storing a record of a dialog between the user and the voice response unit; a dialog state diagram definition file for defining each expected dialog state during a session between the user and the voice response unit; a dialog state determination model for defining a process for determining the current dialog state during the session between the user and the voice response unit; a dialog information analyzing unit, responsive to a determination by the voice response unit that it cannot provide a valid response to the user, for determining the current dialog state between the user and the voice response unit based on the dialog history log, the dialog state diagram definition file, and the dialog state determination model; and a dialog information display unit for receiving the determined current dialog state and visually presenting it for use by a human operator.