A dialogue example. The user state is initialized by the user goal: Finding an attraction and one of its nearby hotels, then booking a taxi to commute between these two places. In addition to expressing pre-specified informable slots and filling in requestable slots, users need to consider and modify cross-domain informable slots (bold) that vary through conversation. We only show a few turns (turn number on the left), each with either user or system state of the current domain, which are shown above each utterance.
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