Turn is defined as one user utterance to the system during a dialog exchange between the user and the system while attempting to perform the task.
2Word recognition accuracy (WA). . : total number of words in reference. Ws: number of reference words which were substituted in output. Wi: number of reference words which were inserted in output. Wd: number of reference words which were deleted in output.
3User satisfaction rating: 1 = strong agreement; 5 = strong disagreement.