Originally Posted by lrdpenn

This is no problem without bags (even if you no-show, if this is the last segment of your ticket.) You can even submit a refund request for taxes later since the flight coupon will show as unused.

I was advised to do just that once when I wanted to drop the last segment of my award ticket (intra-Europe international on partner flights) after checking in. Agent said it was more risky to mess with the reservation and cancel the flight than just no-show, and to request a refund online for taxes a couple of weeks after travel. I (somewhat surprisingly) received a refund without any issue.