Alexa, Let's Work Together: Introducing the First Alexa Prize TaskBot Challenge on Conversational Task Assistance. - Anna Gottardi; Osman Ipek; Giuseppe Castellucci; Shui Hu; Lavina Vaz; Yao Lu; Anju Khatri; Anjali Chadha; Desheng Zhang; Sattvik Sahai; Prerna Dwivedi; Hangjie Shi; et al. (CoRR, 2022)