Often-cited examples of such interactive robots that have a capability of communicating in natural language are the humanoid robot ROBOVIE (Kanda et al., 2002) and robotic museum tour guides like RHINO (Burgard et al., 1999) (Deutsches Museum Bonn), its successor MINERVA touring the Smithsonian in Washington (Thrun et al., 2000), and ROBOX at the Swiss National Exhibition Expo02 (Siegwart and et al, 2003).
dialogue systems used in robotics appear to be mostly restricted to relatively simple finite-state, query/response interaction.