15. The computer-readable storage medium of claim 10 , wherein automatically updating models for the CU service based on the received input comprises updating a domain model, an intent action model, an intent object model and a slot model.
10. A computer-readable storage medium storing computer-executable instructions for enabling an application for Conversational Understanding (CU) using assets in a CU service, comprising: receiving examples of Natural Language (NL) sentences used to interact with the application; detecting a domain, an intent action, and an intent object; receiving input to label the examples; automatically rephrasing the examples of the NL sentences to generate additional sentences that contain different ways of expressing a meaning of the NL sentences; and automatically updating models for the CU service based on the received input, wherein the updated models include the additional sentences.