Flexible Mixed-Initiative Dialogue Management using Concept-Level Confidence Measures of Speech Recognizer Output Kazunori Komatani author Tatsuya Kawahara author 2000 text COLING 2000 Volume 1: The 18th International Conference on Computational Linguistics conference publication komatani-kawahara-2000-flexible https://aclanthology.org/C00-1068/ 2000