Saying No is An Art: Contextualized Fallback Responses for Unanswerable Dialogue Queries Ashish Shrivastava author Kaustubh Dhole author Abhinav Bhatt author Sharvani Raghunath author 2021-08 text Proceedings of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language Processing (Volume 2: Short Papers) Chengqing Zong editor Fei Xia editor Wenjie Li editor Roberto Navigli editor Association for Computational Linguistics Online conference publication shrivastava-etal-2021-saying 10.18653/v1/2021.acl-short.13 https://aclanthology.org/2021.acl-short.13/ 2021-08 87 92