Two days after providing me a "Confirmation number" for a roundtrip ticket to Austria, they sent an email saying
"Thank you for booking your travel on www.united.com.
We are unable to ticket the above-referenced reservation. Some airlines require 24 hours to confirm a seat on their flight. In this case, we were unable to confirm your flight(s) on Swiss International Airlines. Please call us at 800-UNITED1 (800-864-8331) so we can assist you in making alternate arrangements. I apologize for any inconvenience this may cause.
Reservations Processing Center "
I call them immediately after seeing this email, and my call never got through ! I tried to redial, and redial.... n times, in vain.
I later had to book tickets through Lufthansa, (for a much higher price) which gave me confirmed flights the moment I booked it.
Thanks United, for wasting my time, money; testing my patience.