Representing Uncertainty about Complex User Goals in Statistical Dialogue Systems Paul A Crook author Oliver Lemon author 2010-09 text Proceedings of the SIGDIAL 2010 Conference Yasuhiro Katagiri editor Mikio Nakano editor Association for Computational Linguistics Tokyo, Japan conference publication crook-lemon-2010-representing https://aclanthology.org/W10-4336/ 2010-09 209 212