I had to book a relatively last minute (1 week out) flight for next week, solo parent travel with twin 3 year olds. Flight I'm currently on has no more than 2 seats in the same row, but later flight has at least a window-aisle/aisle (and I would ask the middle seat person to switch to the across aisle aisle seat). Am I able to call in and request a free flight change this far out?