24. The non-transitory computer readable storage medium of claim 23 , wherein detecting the user interaction comprises detecting an additional speech input, and determining whether the user interaction is indicative of a problem comprises determining that the additional speech input indicates dissatisfaction with the at least one action.
28. The non-transitory computer readable storage medium of claim 24 , wherein determining whether the additional speech input indicates dissatisfaction includes determining whether the additional speech input contains prosodic indications of frustration.