I have never flown United before so am clueless about this. Family in California for the holidays. Daughters earlier flight sna-sfo and ours a few hours later sna-sfo both say segment waitlisted. I did pay for exit row seats but the ap does not say seat waitlisted, it says segment. Are the flights being changed or is something else happening ? A little nervous as it is a family reunion and we need to get there!