Here it is...
Thanks for contacting us. We appreciate the opportunity to respond.
When plans change, we allow our Customers to have full use of the travel funds for 12 months from the original purchase date as long as the reservation is cancelled at least ten minutes prior to departure. Travel funds can only be applied to a new reservation for the original ticketed Passenger. Funds may not be used for baggage fees; Southwest Vacation Packages; or to purchase Rapid Reward Points, southwestgiftcards, EarlyBird Check-In, inflight alcoholic beverages, and hotel/car rental reservations.
It's our pleasure to answer your e-mail, and we hope to have the opportunity to see you onboard again soon.
Sincerely,