For an Air Canada ("AC") flight, my grandma booked the aisle seat in a column with 2-seat configuration in Economy class. Her only seatmate kept getting up every 15 mins. This is too inconvenient for my grandma, who was hoping to nap. So she tried to negotiate:
She: Sorry to bother you. Will you be getting up a lot?
He: Yes sorry. I need to use the bathroom.
She: Would you like to change seats then?
He: No thanks. I prefer the window seat.
She asked the Service Director (AC's term for purser) for help, but Director said there were no other seats in economy class. She then asked for a seat in another class, but Director apologised and stressed that he can't elevate to other classes in this case. In effect, Director did nothing.
How could my grandma have convinced them to let her sit in another class?
EDIT: Some comments recommend booking a window seat, but my grandma can't righteously do this as she needs to get up regularly too, to stretch, (not every 15 mins. though). She prefers the window seat only if the seatmate gets up more than she, and this is the first time that happened.