I had 2 American airlines vouchers that I had, from last year. They were due to expire so I booked a trip to NYC in december. However, I may want to change the dates to a later date or even bring it forward to october/november. Is there a fee for this?

Also I plan to fly to las vegas and would like to change the destination too, if there is one fixed fee, rather than having to book another return flight to NYC from vegas/LA

I hope you guys can give me some advice!!