Originally Posted by
whimike
I don't think you can change your ticket, as I don't think JFK-DXB-LYS-DXB-DEL is a legal routing for a return portion of a ticket JFK-DEL.
The best, I think, you can hope for is to adjust your return segment so that you have a stopover in DXB. Then, buy a new ticket DXB-LYS-DXB.
Just to confirm the above. The only allowed routing is JFK-DXB-DEL.