Originally Posted by
Flyr89
... Booked one online last night and today the reservation was gone from my profile. I called and the agent said they canceled it since it didnt have at least one UA flight in it.
...,
An reservation without a UA segment will not show online in your accounrt but have never heard of it being cancelled.

Try entering the PNR and your last name under "Manage Reservations" to see if the reservation shows.