“…Our approach is necessary when agents have incomplete desires, as well as incomplete knowledge. Hitchcock, McBurney, and Parsons (2001) and McBurney, Hitchcock, and Parsons (2007) propose deliberation dialogue frameworks, for example, DDF (McBurney et al, 2007), equipped with fundamental elements for deliberation dialogues such as locutions, commitments, and termination. Kok et al (2010) give an argumentation framework for deliberation dialogue taking into account agent's preference.…”