I am not aware of any meeting rooms, but I have never looked. The United lounge has been very crowded when I’ve been in it, and I’m not sure that there are any private areas like there are in some lounges. If you are at the D gates, you can usually find a gate without a flight which should be relatively quiet (albeit with the overhead announcements). If you are at th A/B gates, they have some gates blocked off (I forget which hallways). It should be relatively quiet by the barrier. If you are by C gates, that is all Southwest and can be very busy and very loud with all the people and slot machines. I cannot give you any information if you happen to be in E gates (international terminal).