1. A method of processing speech, the method comprising: receiving a word lattice generated by an automatic speech recognizer based on a user speech representing a query; receiving a prosodic analysis of the user speech; generating a reweighted word lattice based on the word lattice and the prosodic analysis; approximating based on the reweighted word lattice at least one relevant response to the query; and presenting to a user one of the at least one relevant response to the query.