I used United because they were the cheapest option to go to Seoul, Korea for a family vacation/ reunion. Well, I purchased tickets for myself and my twin sister, however, I assumed since I bought the tickets together they would seat us together on a eleven and a half hour flight but they didn't for the flight there or back. Every time I tried to talk to someone at the counter or kiosk they would turn me away claiming they weren't \""available\"" yet and were very rude. I wanted to see if we could get seated together but every employee immediately said \""it's a full flight there are no seats available\"" and wouldn't even check the computer. This happened at the Salt Lake City and San Francisco location. So I gave up and I had to sit apart from my sister on the long flight...The flight attendants were very nice and friendly which is why I gave a 2 star but the people who work behind the counter are not very good with customer service. I won't use United again.