1. A system for multi-pass speech recognition, comprising: an input device configured to receive a natural language utterance; and a multi-pass speech recognition module configured to transcribe the natural language utterance, wherein to transcribe the natural language utterance, the multi-pass speech recognition module is further configured to: use a dictation grammar to transcribe the natural language utterance in response to a platform associated with the multi-pass speech recognition module having the dictation grammar available; or use a virtual dictation grammar to transcribe the natural language utterance in response to the platform associated with the multi-pass speech recognition module not having the dictation grammar available.