SARA (Socially-Aware Robot Assistant) is an embodied intelligent personal assistant that analyses the user's visual (head and face movement), vocal (acoustic features) and verbal (conversational strategies) behaviours to estimate its rapport level with the user, and uses its own appropriate visual, vocal and verbal behaviors to achieve task and social goals. The presented agent aids conference attendees by eliciting their preferences through building rapport, and then making informed personalized recommendations about sessions to attend and people to meet.
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Matsuyama et al. (2016) studied this question.