Stefan Ultes, Paweł Budzianowski, Iñigo Casanueva, Nikola Mrkšić, Lina M. Rojas-Barahona, Pei-Hao Su, Tsung-Hsien Wen, Milica Gašić, Steve Young. Proceedings of the 18th Annual SIGdial Meeting on Discourse and Dialogue. 2017.
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Ultes et al. (2017) studied this question.