An Empirical Evaluation of a Statistical Dialog System in Public Use Jason Williams author 2011-06 text Proceedings of the SIGDIAL 2011 Conference Joyce Y Chai editor Johanna D Moore editor Rebecca J Passonneau editor David R Traum editor Association for Computational Linguistics Portland, Oregon conference publication williams-2011-empirical https://aclanthology.org/W11-2016/ 2011-06 130 141