USER
Hi there, I want to make an order.
make an order
pizza_ordering.pizza_ordering
ASSISTANT
How can I help you?
USER
I want to order a large Pepperoni Pizza.
large
pizza_ordering.size.pizza.accept
pizza_ordering.size.pizza.accept
Pepperoni Pizza
pizza_ordering.name.pizza.accept
pizza_ordering.name.pizza.accept
ASSISTANT
What toppings do you want?
USER
I would like to have pineapples and spinach.
pineapples
pizza_ordering.type.topping.accept
pizza_ordering.type.topping.accept
spinach
pizza_ordering.type.topping
pizza_ordering.type.topping
ASSISTANT
Great, let me check that for you. 
USER
Thank you.
ASSISTANT
Sorry, there is no more spinach at this moment.
spinach
pizza_ordering.type.topping
pizza_ordering.type.topping
USER
How come?
ASSISTANT
The restaurant has ran out of spinach.
spinach
pizza_ordering.type.topping.reject
pizza_ordering.type.topping.reject
USER
What else is available?
ASSISTANT
There are other toppings you can choose from.
USER
I would like to substitute it with meatballs.
meatballs
pizza_ordering.type.topping.accept
pizza_ordering.type.topping
ASSISTANT
Great, let me check that for you.
USER
Sure, take your time.
ASSISTANT
Meatballs are available. I will add that as soon as possible.
Meatballs
pizza_ordering.type.topping.accept
pizza_ordering.type.topping.accept
USER
Great thanks!
ASSISTANT
You are welcome.
USER
When will order be ready?
ASSISTANT
your pizza order is complete and the pizzas will be ready for pickup in about 25 minutes and your receipt will be sent to your mobile device via text message.
your pizza order is complete
pizza_ordering.pizza_order.accept
pizza_ordering.pizza_order.accept
USER
Thank you!
ASSISTANT
No problem.