USER
I would like to place an order for pizza
ASSISTANT
Sure, where at sir?
USER
I was thinking about Sauce
Sauce
pizza_ordering.preference
ASSISTANT
Right away sir, let me look that up
USER
Great
ASSISTANT
What would you like?
USER
A all meat speciality pizza please
all meat speciality pizza
pizza_ordering.name.pizza.accept
pizza_ordering.name.pizza
ASSISTANT
You got it
USER
Can I please switch out the sausage for bacon?
sausage
pizza_ordering.type.topping
pizza_ordering.type.topping.reject
bacon
pizza_ordering.type.topping
pizza_ordering.type.topping
ASSISTANT
Let me ask sir
USER
Ok
ASSISTANT
Yes we can switch out the sausage for bacon sir.
sausage
pizza_ordering.type.topping
pizza_ordering.type.topping.reject
bacon
pizza_ordering.type.topping
pizza_ordering.type.topping
USER
Awesome thank you
ASSISTANT
And to confirm sir we have an all meat speciality pizza?
all meat speciality pizza
pizza_ordering.name.pizza.accept
USER
 Correct 
ASSISTANT
And switching out the sausage for bacon?
sausage
pizza_ordering.type.topping
pizza_ordering.type.topping.reject
bacon
pizza_ordering.type.topping.accept
pizza_ordering.type.topping.accept
USER
Correct.
ASSISTANT
It will be ready for pick up in 25 minutes 
USER
Sounds good.
ASSISTANT
And receipt will be sent via mobile text.