8. A system comprising: a processor; and a computer-readable storage medium having instructions stored which, when executed on the processor, perform operations comprising: training a spoken dialog system using task-independent call-types of a previous application; recognizing a user utterance using the spoken dialog system, to yield a recognized user utterance; determining an acceptance threshold and a rejection threshold based on an entity referenced in the recognized user utterance; classifying the recognized user utterance, to yield a classification, where the classification meets one of: the rejection threshold, the acceptance threshold, and both the rejection threshold and the acceptance threshold; when the classification meets the acceptance threshold acting according to a call-type associated with the classification; and when the classification meets the rejection threshold, and does not meet the acceptance threshold, transcribing the recognized user utterance and using the recognized user utterance for further training of the spoken dialog system.
8. A system comprising: a processor; and a computer-readable storage medium having instructions stored which, when executed on the processor, perform operations comprising: training a spoken dialog system using task-independent call-types of a previous application; recognizing a user utterance using the spoken dialog system, to yield a recognized user utterance; determining an acceptance threshold and a rejection threshold based on an entity referenced in the recognized user utterance; classifying the recognized user utterance, to yield a classification, where the classification meets one of: the rejection threshold, the acceptance threshold, and both the rejection threshold and the acceptance threshold; when the classification meets the acceptance threshold acting according to a call-type associated with the classification; and when the classification meets the rejection threshold, and does not meet the acceptance threshold, transcribing the recognized user utterance and using the recognized user utterance for further training of the spoken dialog system. 9. The system of claim 8 , wherein when the classification does not meet the rejection threshold, the user utterance comprises a task-specific call-type.