This is probably a hopeless case but asking anyway. We started a DONE4 back in January but after completing the first leg fell sick so had to return home (on a separate ticket). We haven't been able to use the rest of the ticket and the earliest possible time to complete the next segment will be a few days after 12 months since we took the first flight. Do I have any hope of extending the ticket validity to cover the rest of the trip (about 1 month)?