When you're booking a flight, if you want to be allocated a seat next to whoever you're flying with, then you should book it - not rely on the kindness and generosity of strangers to accommodate you.
That's why one woman has been given praise after she stopped a woman from moving to help out another person - which would normally be the kind thing to do, but the lady next to her was sitting in premium economy, and the person who wanted to swap was sat in standard seating, making the swap a little unfair.
TikToker @not.cristinayang made a video in response to a comment on a video she'd done previously which read: "I never give up my seat. Flying is a preplanned event. Someone's failure to plan isn't my problem", followed by an eye-roll emoji.