1. A method 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 at least in part on an entity referenced in the recognized user utterance; classifying the recognized user utterance, to yield a classification; when the classification is associated with the acceptance threshold, acting according to a call-type associated with the classification; and when the classification is associated with the rejection threshold, transcribing the recognized user utterance and using the recognized user utterance for further training of the spoken dialog system.