Hi,
Last year I booked the Radisson Narita hotel with the $250 voucher given to those whose Hilton $2 rates were cancelled. This 2 night hotel stay is next month since the hotel price of $125 per night worked out to exactly $250 with no out of pcoket cost to me.
I cannot make the dates I selected
If I cancel are there any costs, since I just booked with a voucher?

If I do not show up, is there any costs to me since I used a voucher?

If I reschedule dates is there a change fee involved sicne I used a voucher and did not use a credit card?

Can I add my Radisson Goldpoints account to the reservation and receive credit for the stay?
Thanks for any advise