A DING! fare has come out that is lower than my existing fare. If I go into the Travel Center and cancel my existing fare it gives me the option to have a portion of that fare (the taxes) refunded or held for future use. If I choose to have that portion refunded, will the rest of the funds from the fare that I am cancelling be immediately available to reuse as Ticketless Travel Funds? I want to be able to use those funds right away to book the lower DING! fare.