Anytime the airline makes a schedule change to your reservation you are allowed 1 free change which can include your departure and arrival dates as long as the city pairs stay the same and the dates are within 14 days of your original flight. Once you make the 1 free change any extra changes will require a difference in fare to be paid. If after you make a change and they change it again you should get 1 more free change. The changes should be made within 3 days of receiving the email telling you that "there has been a change to your upcoming Southwest flight" If you didn't make a change after SW made a schedule change You could try calling reservations to see if they can make the change, reach out on Facebook or Twitter in a DM, or use the SW in app chat feature. On another note since you are A List preferred if the flight you want to travel on leaves before the one your booked on you can use your free same day standby perk unfortunately this only works for flights departing before your scheduled flight. -Blake
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