@inproceedings{ai-etal-2007-comparing-user,
    title = "Comparing User Simulation Models For Dialog Strategy Learning",
    author = "Ai, Hua  and
      Tetreault, Joel  and
      Litman, Diane",
    booktitle = "Human Language Technologies 2007: The Conference of the North {A}merican Chapter of the Association for Computational Linguistics; Companion Volume, Short Papers",
    month = apr,
    year = "2007",
    address = "Rochester, New York",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/N07-2001",
    pages = "1--4",
}