How can i send the 2d navigation goal to rviz by voice command using pocketsphinx(Turtle bot)

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There is very simple demo of something like that, the code is a bit old and might need a few updates, but it is posted here: https://github.com/mikeferguson/maxwell/blob/sixdof/maxwell_navigation/nodes/goto.py

You'll notice that the goals are hard coded (the easiest way to do this is to use rostopic echo on the move_base goal topic, and click on your "goals" in rviz), basically, I have a name for each pose (was basically the center of the office). Video here: http://www.youtube.com/watch?v=8aABif3W6MY

UPDATE: As for implementing this on TurtleBot, if you have navigation (http://ros.org/wiki/turtlebot_navigation) running, you will need to fire up pocketsphinx with your dictionary of words (see the docs for the node http://ros.org/wiki/pocketsphinx) and make that goto.py script have the proper names and places.