Searched for this, but couldn't find a situation exactly parallel:

A family member has a ticket on Continental to fly XXX-YYY-XXX, which cost $219. Now, instead of flying the return YYY-XXX, he has to travel from YYY-ZZZ-XXX, and these two legs will not be on Continental.

If he cancels the YYY-XXX segment, will CO reprice the ticket as if he just now bought a XXX-YYY one way? Or is it best not to cancel and just not show up for that segment (his silver OP number is already on the reservation)?

Thanks for any help.