Originally Posted by
mduell
You don't if you do it that way. UA can and will change inventory at any time.
Here's what you do:
1) Hold an award reservation for 2 passengers with the flights you want.
2) Split the reservation.
3) Ticket each separately from your own miles.
Splitting doesn't always work if there are partners involved.
I would suggest holding 1, then holding the other, then ticketing both.