A Conversational Agent Model (CAM) adopts that aspect of the human interface that provides structure for the process of interpreting meaning. The goal of the model is to target those behaviors that regulate and represent information efficiently. The specific CAM is based on the Evolutionary Game Theory that considers an idealized scenario whereby a population of agents (possible behaviors) play an evolutionary game according to a pre-programmed behavior pattern and it is supposed that some evolutionary selection process operates over time on the distribution of behaviors. The selected behaviors interact with human using the interface.