We propose in this paper a framework for inter-agents dialogue on actions, which formalize a deliberative process. This framework bounds a dialectical system in which argumentative agents arbitrate and play to reach a practical agreement. For this purpose, we propose an argumentation-based reasoning to manage the conflicts between plans having different strengths for different agents. Moreover, we propose a model of agents which justify the plans to which they commit and take into account the plans of their interlocutors. In the scope of our dialectical system, an agent is responsible of the final decision outcome which is taken according to the autority of the players, the uttered plans and her own rules and priorities. We illustrate this paper with a services composition.