A different approach is to use dialogs between a system and its users as proposed by Artzi and Zettlemoyer (2011) using the DARPA communicator corpus (Walker et al., 2002).
in that work utterances were selected to be shorter than 6 words and to include one noun phrase present in the lexicon used during learning while ignoring short but common phrases such as "yes" and "no"; thus it is unclear whether it would be applicable to our dataset.