In this paper we study the aspects of the Human-MAS Interaction found in organizational applications based on MAS. The increasing the number of MAS applications inside organizations introduces a basic problem: how should the user interact with such systems? The problem invloves many questions that influence the proper architecture of the MAS and must not only be considered as a fine detail but should be taken into acount from the beginning in the MAS development. Among the most important questions we can stress the interaction modes (multimodal, based on natural language, voice-based,point-and-click interfaces) and the personalization or adaptability of the interaction and the services. From such questions and using our experience in the development of MAS application for organizations, we present in this articlea MAS architecture, the user interacts with a single assistant agent able to personalize the interaction with the user as well as a set of other services. Beyond the previous questions, such as distributed arhcitecture offers solutions for the computational aspects found in a MAS, like the complexity and the use of resources.