*Shintaro Okazaki¹, Tan Viet Tuyen Nguyen², Oya Celiktutan² (1. Department of Marketing, King’s Business School, King's College London, 2. Faculty of Natural, Mathematical, & Engineering Sciences Department of Engineering Centre for Robotics Research (CoRe), King's College London)

*Takayoshi Yamada¹, Cheng Kelvin², Soh Masuko³, Keiichi Zempo¹ (1. University of Tsukuba, 2. Rakuten Mobile, Inc., 3. Shibaura Institute of Technology)

*Yi-Cheng Ku^1,2, Nien-Hsiang Tsai¹ (1. Department of Business Administration, Fu Jen Catholic University, 2. Service Design Research Center, Fu Jen Catholic University)