I'd like to order a pizza.
Sure. Where do you want to order from?
Luigi's
Ok. Please tell me your order details.
I'd like to get a large mushroom meat pizza.
Do you want the pizza as it comes?
No. I'd like to swap onions for the mushrooms.
I'm sorry, onions aren't available. Would you like to change your order?
Yes, I'd like extra sausage instead.
Would you still like the mushrooms?
No.
Do you want to order anything else?
No, just the pizza.
Do you want this order for delivery or pick-up?
Delivery.
Would you like to add a 2 liter of soda for just $1?
No, I only want the pizza.
Ok, so you want a large mushroom meat pizza with no mushrooms and extra sausage for delivery. Your total comes to $15. Do you need a receipt?
Yes
It will be delievered to your mobile device. The pizza will be delivered in 25 minutes.