I am booked on a flight from JFK-MNL on CX in F in mid-October. I wanted to stay a little longer so was looking to change the date of my outbound or return flight. I called and checked on availability in J and F both up to 5 days before the outbound and up to 5 days after the return and there are no seats available on any day. Is there any chance more seats will open up and should I keep calling or should I look to book something on another airline? Also, if I cancel my award reservation can I redeposit my miles for a fee? I am a newbie here so sorry if these are dumb questions.