5. The method of claim 1 further comprising: defining one or more characteristics associated with the uttered proper name; and formulating the indirect confirmation question by incorporating at least one characteristic of the one or more characteristics in the first machine response.
7. The method of claim 5 further comprising generating a second machine response the user utterance including an additional indirect confirmation question related to the proper name, wherein the second machine response does not repeat the proper name, if the second confidence score is below the defined threshold value.