Do you want to change the date of the return flights or cancel it altogether?
I want to change the date of return flights. Can I change? How much is the fee if I can?
If no biz class seat available, I'd go with economy class. May I get some miles back?
If no economy class available, I want to cancel the ticket and buy the ticket with cash. May I get the miles back?
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I was also under the impression that you can't (easily) make changes to an award ticket once you've already flown part of it. But it's worth giving them a call - please do let us know how you go.