Assuming you did this less than 24 hours ago, you can cancel the leg you don't want and get a refund to your original form of payment. If more than 24 hours ago, when you cancel the leg, you would get a travel fund. BTW if your travel date is between 9/15/and 11/3, there is a fare sale going on now and you might find it advantageous to change everything if the fare is lower.
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