If I understood right I have until one year from the original date of the trip to use the voucher on another trip, is that correct?

My friend doesn't think he will be financially able to go on any trips before that time. His name is on one of the two vouchers (my name being on the other of course). Since the tickets were charged to my credit card I think I should be able to have the second voucher be switched over to someone else who may go on a trip with me. Sometime in the time frame from late May to early July myself and my grandmother might travel out to my uncles in Washington state. I was just thinking it would be nice to get the voucher switched over for her, instead of having my friend pay me back for a ticket he will not be able to use.