"Ok, then we will plan on 110."

"But what if only 90 people come?"

"Well what do you mean?"

"Well how do you work that, I mean, the quote you gave me was per person, right?"

"Right. So when you tell me 110 confirmed, I bill you for 110."

"But if only 90 people come, you will only charge me for 90, right?"

"No, I will still charge you for 110 because that's what I am making food for."

"Well maybe I should just confirm for 90."

"But you said you had 110 confirmed."

"Well I do but I am worried some won't show and I will be paying for 20 people for no good reason."

"Well, you can confirm for 90 if you wish. But I will only make food for 90 people, not 110."

"Well why would you do that? Why wouldn't you just make the food for 110 and charge me for 90?"

"Because I am not in the business to give away 20 dinners for free."

"But if they weren't there..."

"If they weren't there, I would still be out the 20 extra dinners I prepared. If you want me to confirm for 90, I will. But the fact is, 110 people have confirmed and 20 of those people won't have anything to eat."

"Well it all seems wrong."

"Ok, if you invited me to dinner and I said I was bringing 4 people and I showed up with 24, what would you do?"

"Well that wouldn't even be right. You can't just do that to someone..."

"My point exactly."