USER
Hi, I was calling to order a pizza. Do you guys have any specials today? 
ASSISTANT
We sure do, it's free toppings day! Any two toppings are free, any more is extra. 
USER
Great! In that case, I'd like to order an extra large pizza with two toppings.
extra large
pizza_ordering.size.pizza
pizza_ordering.size.pizza
ASSISTANT
Sure thing! What sauce would you like for your pizza?
USER
Um, barbecue.
Um, barbe
pizza_ordering.preference
barbecue
pizza_ordering.preference
ASSISTANT
And the crust? 
USER
What kind do you have? 
ASSISTANT
Thin, Thick and Stuffed crust.
Thin
pizza_ordering.type.crust
pizza_ordering.type.topping
Thick
pizza_ordering.type.crust
pizza_ordering.type.topping
Stuffed crust.
pizza_ordering.type.crust
pizza_ordering.type.topping
USER
Stuffed Crust sounds good!
Stuffed Crust
pizza_ordering.type.crust
pizza_ordering.type.crust
ASSISTANT
And what two toppings did you want with that? 
USER
Mushrooms and Olives.
Mushrooms
pizza_ordering.type.topping.accept
pizza_ordering.type.topping.accept
Olives
pizza_ordering.type.topping
Olives.
pizza_ordering.type.topping
ASSISTANT
Oh, I'm sorry. We don't have any olives at this time, would you like a different topping?
olives
pizza_ordering.type.topping.reject
pizza_ordering.type.topping.reject
USER
Um, sure. I'll take...sausage instead.
sausage
pizza_ordering.type.topping.accept
pizza_ordering.type.topping.accept
ASSISTANT
Yum, sounds great! Anything else for your pizza? 
USER
Nope. My order's complete. 
ASSISTANT
Alright! Your Extra Large Barque Stuffed Crust with Mushrooms and Sausage pizza will be ready in 25 minutes for pick up. Would you like a receipt?
Extra Large
pizza_ordering.size.pizza.accept
pizza_ordering.size.pizza.accept
Barque
pizza_ordering.preference.accept
pizza_ordering.preference.accept
Stuffed Crust
pizza_ordering.type.crust.accept
pizza_ordering.type.crust.accept
Mushrooms and Sausage pizza
pizza_ordering.name.pizza.accept
pizza_ordering.name.pizza.accept
USER
No thank you. 
ASSISTANT
Okay. Enjoy your pizza! Sounds delicious. 
USER
Thanks I will! Goodbye.
ASSISTANT
Your welcome, goodbye.