Proceedings of the 2nd Workshop on Natural Language Processing for Conversational AI Tsung-Hsien Wen editor Asli Celikyilmaz editor Zhou Yu editor Alexandros Papangelis editor Mihail Eric editor Anuj Kumar editor Iñigo Casanueva editor Rushin Shah editor 2020-07 Association for Computational Linguistics Online text conference publication nlp4convai-2020-natural https://aclanthology.org/2020.nlp4convai-1.0/