Conversational recommender systems support users in accomplishing recommendation-related goals via multi-turn conversations. To better model dynamically changing user preferences and provide the community with a reusable development framework, we introduce IAI MovieBot, a conversational recommender system for movies. It features a task-speci c dialogue ow, a multi-modal chat interface, and an e ective way to deal with dynamically changing user preferences. The system is made available open source and is operated as a channel on Telegram. CCS CONCEPTS • Information systems → Users and interactive retrieval; Recommender systems.

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