If you are flying within the United States no ID is required for anyone under the age of 18 flying with their own ticket. Being unrelated won't matter, but it never hurts to have a signed letter from a parent consenting to the travel. It's unlikely you would receive any compensation for the change, but you are eligible to make a free change if there is a another option that you like better. Check the schedule and see if you would prefer something else. The free change must be done rather soon after Southwest changes your flight so don't delay. I think it's within 72 hours? The email notifying you of the change should have included links to make the free change online. You could also call and wait on hold for a long time. --TheMiddleSeat
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