1. A method comprising: while receiving speech from a user a part of a conversation with an interactive turn-taking spoken dialog system identifying a starting point associated with the speech, the starting point being at a first time; identifying content of the speech received between the first time and a second time, to yield identified content; and identifying an end point associated with the speech, wherein the end point is a pinch node in a content lattice; and returning, via a processor, a result based on a parameter associated with the starting point and the end point.