I want to purchase a pizza from dominos pizza?
Okay, I can do that for you. Which location?
Whichever is closest to me and open is fine. 
Okay, I've located the closest Dominos. One moment.
Okay perfect,
What sort of pizza would you like me to order?
I've got friends over so I need a X-Large, maybe a pepperoni?
Okay, they don't have pepperoni.
Oh, do they have supreme?
Yes, they do indeed have Supreme, would you like that?
Yes, but can you substitute the bacon for extra sausage?
They can do that, yes. 
Perfect, thanks. 
Would you like anything else?
No, that's all.
Okay, I've confirmed payment to your account on file, is that right?
Yes, that is perfect. 
That concludes the order then, a X large Supreme and substitution of extra sausage for the bacon?
Yes, that's perfect.
Okay, the order will be available for pick up in 25.