1. Institute of Communications Engineering, Ulm University Ulm, Germany, Ubiquitous Computing Systems Laboratory, NAIST, Ikoma, Nara, Japan
2. Human-Centered Artificial Intelligence, University of Augsburg, Augsburg, Germany
3. Institute of Communications Engineering, Ulm University, Ulm, Germany
4. Natural Language Generation and Dialogue Systems, University of Bamberg, Bamberg, Germany