I order my smoothie, and as it's being made, I pay. Whenever I pay, the staff ask "would you like a pastry with that?"
I don't want a pastry with my smoothie and say "no thank you".
But that got me to thinking - is there a way in which I could ask for my smoothie in such a way that I won't get asked if I want a pastry at all. Saying "I would like a mango smoothie but I don't want a pastry" is a little direct and maybe a little rude.
I've tried "I would just like a smoothie". I've tried "I would like just a smoothie". I've tried "I'd just like a smoothie today please". And I always get asked if I would like a pastry.
So - I give up - I cannot think of a way to ask for my smoothie which precludes the staff from asking if I want a pastry but which doesn't make it clear that I know they're going to ask about pastries.