... dialogues, we distinguish between task level goals and plans (e.g., investing, traveling), and communicative level inten- tions and speech acts (e.g., explaining, re- questing information) [2,6,11]. ... (sentence 14). In the case of inconsistent values (sentence 20), a subplan is inserted for explaining why the value is inconsistent and asking the user to change something in order to correct the ... commu- nicative intentions for constructing and re- fining the task-level plan. A complete ad- vice giving session contains three phases: problem formulation, resolution and pre- sentation...