USER
I want to order a pizza.
ASSISTANT
Yes, what kind of pizza would you like?
USER
I would like to have a bacon, sausage, and ham pizza with pineapples.
bacon
pizza_ordering.type.topping
pizza_ordering.type.topping
sausage
pizza_ordering.type.topping
ham pizza
pizza_ordering.name.pizza
ham
pizza_ordering.type.topping
pineapples
pizza_ordering.type.topping
pizza_ordering.type.topping
ASSISTANT
We are all out of pineapples. Would you care for peppers instead?
pineapples
pizza_ordering.type.topping
pizza_ordering.type.topping.reject
peppers
pizza_ordering.type.topping
USER
Yes, that sounds great. 
ASSISTANT
Okay, what size pizza would you like?
USER
How much is a large pizza?
large
pizza_ordering.size.pizza
pizza_ordering.size.pizza
ASSISTANT
I'm sorry we only have small and extra large.
small
pizza_ordering.size.pizza
pizza_ordering.size.pizza
extra large.
pizza_ordering.size.pizza
extra large
pizza_ordering.size.pizza
USER
Okay, how much is an extra large pizza?
extra large
pizza_ordering.size.pizza
pizza_ordering.size.pizza
ASSISTANT
An extra large pizza is $14.99 +$1.00 per topping.  
extra large
pizza_ordering.size.pizza
USER
Oh, that's too much.  How much is a small?
smal
pizza_ordering.size.pizza
ASSISTANT
A small will be $10.99 +$1.00 per topping.
small
pizza_ordering.size.pizza
USER
That sounds better. I'd like a small pizza with bacon, sausage, ham and peppers.
small
pizza_ordering.size.pizza
pizza_ordering.size.pizza.accept
bacon
pizza_ordering.type.topping
pizza_ordering.type.topping.accept
sausage
pizza_ordering.type.topping
ham
pizza_ordering.type.topping
pizza_ordering.type.topping.accept
peppers
pizza_ordering.type.topping.accept
pizza_ordering.type.topping
ASSISTANT
Sure, that will be $14.99.
USER
I have my credit card on file that you can charge. 
ASSISTANT
OK, I'll place your order. 
USER
Thanks!
ASSISTANT
Your order is now complete and will be ready for pickup in 25 minutes.
Your order is now complete
pizza_ordering.pizza_order.accept
pizza_ordering.pizza_order.accept
USER
Sounds good.
ASSISTANT
Your receipt will be sent to your mobile device via text message.
USER
Thank you.
ASSISTANT
You are welcome. Enjoy the pizza.