Can someone please help me I booked 2 first class () AA tickets with BA avios points from LGA 2 MIA and then my sister decided to come along but AA is not showing anymore award saver seats on that flight Is there anyway I can get her on my booking even so it's not showing any availability or should I cancel my booking and look on the earlier flight that shows availability? And if the option is cancelling is there any cancellation fee or change fee within the 24 hours?
First of all, please try to use proper punctuation and correct your spell check errors when asking questions. It makes it really annoying to read and decipher your question.
Regarding your question, there's no real way to open award space on the flight you want. Your options are either to wait and see it award space opens some time between now and your flight or just cancel and rebook onto the earlier flight if it has availability. There's no fee to cancel within 24hrs of booking, after that, you'll just lose the $5.60 tax per ticket as long as you're not within 24hrs of the flight.