A Statistical Spoken Dialogue System using Complex User Goals and Value Directed Compression Paul A Crook author Zhuoran Wang author Xingkun Liu author Oliver Lemon author 2012-04 text Proceedings of the Demonstrations at the 13th Conference of the European Chapter of the Association for Computational Linguistics Frédérique Segond editor Association for Computational Linguistics Avignon, France conference publication crook-etal-2012-statistical https://aclanthology.org/E12-2010/ 2012-04 46 50