1. An automated arrangement employing at least one hardware implemented computer processor for conducting natural language interactions with a human user, the arrangement comprising: a user interface for user communication in a given active natural language interaction with a natural language application during an automated dialog session; an automatic speech recognition (ASR) engine for processing unknown user speech inputs from the user interface to produce corresponding speech recognition results; a natural language concept module for processing the speech recognition results to develop corresponding natural language concept items; and a concept item storage for holding selected concept items for reuse in a subsequent natural language interaction with the user during the automated dialog session.