1. A vehicle system having a conversational system, said vehicle system comprising: a system bus for communicating data and control signals received from said conversational system to a computer system in said vehicle system; a vehicle data and control bus for connecting devices and sensors in said vehicle system; a bridge module for connecting said vehicle data and control bus to said system bus; one or more vehicle subsystems coupled to said vehicle data and control bus; a user interface for receiving a voice command or input signal from a user for modifying a voice command set in said conversational system; a memory coupled to said system bus for storing one or more action command sequences for a new voice command, wherein said conversational system receives an input from at least one of the vehicle subsystems in response to a user action performed on the at least one vehicle subsystem during a dialog with said conversational system and provides in response thereto at least one new action command that corresponds to the new voice command; and a central processing unit coupled to said system bus for executing the at least one new action command by automatically sending a command message to the at least one vehicle subsystem when said new voice command is spoken.