Listen, stella, you ought to learn from MG.
Basically, he wanted to say, 'Sorry, ma'am! No space for you on the
plane!'. But, he did it with such tact and diplomacy.
If it were you, you'd just say something like, 'You're too heavy,
the plane cannot take off lah!'

At least, MG doesn't let people feel 'buay song', although the msg
is the same! 
Learn, stella, learn from the Master Gentleman! 