Dialogue Helpsystem based on Flexible Matching of User Query with Natural Language Knowledge Base Sadao Kurohashi author Wataru Higasa author 2000-10 text 1st SIGdial Workshop on Discourse and Dialogue Association for Computational Linguistics Hong Kong, China conference publication kurohashi-higasa-2000-dialogue 10.3115/1117736.1117752 https://aclanthology.org/W00-1016/ 2000-10 141 149