“…They include but are not limited to conversational search conceptualization (e.g., Azzopardi et al [2018], Deldjoo et al [2021], and Radlinski and Craswell [2017]), effective conversational query re-writing (e.g., Yu et al [2020]), generating and selecting clarifying questions (e.g., Zamani et al [2020a, c]), conversational preference elicitation (e.g., and Zhang et al [2018]), and understanding user interactions with spoken conversational systems (e.g., Trippas et al [2018Trippas et al [ , 2020). The growing body of work in this area has been supplemented by an increasing number of recent seminars (e.g., Anand et al [2020]), workshops (e.g., , Burtsev et al [2017], Chuklin et al [2018], and Spina et al [2019]), tutorials (e.g., Fu et al [2020] and Gao et al [2018]), shared tasks (e.g., Dalton et al [2019Dalton et al [ , 2020, Ram et al [2018]), and datasets (e.g., Aliannejadi et al [2019], Choi et al [2018], , Reddy et al [2019], Thomas et al [2017], Trippas and Thomas [2019], and Zamani et al [2020b]). Despite this great success, there are still numerous open problems in this domain that require in-depth investigation.…”