Good morning, I'd like to buy a cake.
No problem sir, we have many cakes here, what size would you like?
Well, it's for my coworker's birthday, there are 14 people in the office.
Well, this cake feeds 12 people and this one behind it feeds 20.
I'll take the bigger one, it's better to have too much than not enough.
Sounds good, do you want it delivered?