Originally Posted by
daniellam
Agent (assuming he/she is only a "reservations" agent and does not handle "ticketing") needs to call the ticketing help desk to have control of the electronic flight coupons for the ANA segments taken back. Once UA has regained control, they can then go ahead and exchange the ticket.
Correct!
I just had a similar experience last week as OP experienced. GS agent was helpful and reached out to NH and sorted it out.
Although it is 016 ticket, it does not mean UA has Titian control when one of the segments is not on UA metal.