Yes, they do! I flew Southwest to Honolulu last year for a family trip. Funny thing—I booked the wrong return date because I was rushing between meetings. Calling ☎️ fixed everything instantly, and the rep even let me know about better timing for my flight. Ever since then, I always call when I need quick modifications. The Honolulu routes fill up fast, so having someone check availability in real time was a life saver.