Changing name on reward ticket

Hi
One of my friends and I were due to fly to Dubai next month. I had purchased both our tickets as rewards. However, something has now come up and he won't be able to make it. One of my other friends has now jumped at the chance for a free trip to Dubai. Is it possible to change the reward ticket to a different name? I am aware I may need to pay more miles or an administration fee but I don't mind. I really need to keep the dates as they are as I have booked hotels rooms and the good deal I got makes them non-refundable.
I just checked on the VA website and found that there are no more reward seats available for the outbound and inbound dates. However, if I cancel friend A's booking, will that free up a reward seat, thus allowing me to book friend B's reward flight?????
Thanks in advance for any help!!!!
One of my friends and I were due to fly to Dubai next month. I had purchased both our tickets as rewards. However, something has now come up and he won't be able to make it. One of my other friends has now jumped at the chance for a free trip to Dubai. Is it possible to change the reward ticket to a different name? I am aware I may need to pay more miles or an administration fee but I don't mind. I really need to keep the dates as they are as I have booked hotels rooms and the good deal I got makes them non-refundable.
I just checked on the VA website and found that there are no more reward seats available for the outbound and inbound dates. However, if I cancel friend A's booking, will that free up a reward seat, thus allowing me to book friend B's reward flight?????
Thanks in advance for any help!!!!