Abstract. In human relations engagement and continuous communication is promoted by the process of sharing experiences. This type of social behaviour plays an important role in the maintenance of relationships with our peers and it is grounded by cognitive features of memory. Aiming at creating agents that sustain long-term interactions, we developed MAY, a conversational virtual companion that gathers memories shared by the user into a three layer knowledge base, divided in Lifetime Periods, General Events and Event-Specific-Knowledge. We believe that its cue sensitive structure increases agent adaptability and gives it capabilities to perform in a social environment, being able to infer about the user's common and uncommon events. Results show that these agent's capabilities contribute to development of intimacy and companionship. Key words: virtual companion, biographical memory, shared memory