18. The spoken dialog system of claim 17 , wherein the method further comprises, prior to the training, training the acoustic and language models using another set of transcribed data, recognizing utterances in a set of candidates for transcription using the acoustic and language models and computing by a processor confidence scores of the utterances.
18. The spoken dialog system of claim 17 , wherein the method further comprises, prior to the training, training the acoustic and language models using another set of transcribed data, recognizing utterances in a set of candidates for transcription using the acoustic and language models and computing by a processor confidence scores of the utterances. 19. The spoken dialog system of claim 18 , wherein the method further comprises selecting k utterances that have the smallest confidence scores from the set of candidates and transcribing them into a first additional transcribed set, adding the first additional transcribed set to the another set of transcribed data to produce the set of transcribed data and removing the first additional transcribed set from the set of candidates and wherein the retrieved set of un-transcribed data is retrieved from the set of candidates.