... Proceedings of the 45th Annual Meeting of the Association of Computational Linguistics, pages 792–799,Prague, Czech Republic, June 2007.c2007 Association for Computational LinguisticsLearning ... provision and gathering of information ine.g. social dialogue. In the latter category of dia-logue systems, a high level of naturalness of interac-tion and the occurrence of longer periods of satisfac-tory ... (composed of the values of the features listedin Table 2). For instance, in the papolicy, the deci-sion in the last row of the table (give a joke or not),depends on whether or not there has...