Can you order a medium pizza at Eagle Pizzeria?
Sure, how many toppings?
Two toppings, green peppers and sausage only
Okay so that is a medium pizza at Eagle Pizzeria with green peppers and sausage.
That's correct.
Thanks I'll make that order right now. Please hold while I pull up your stored account information.
Thank you
I submitted the order but it appears they are out of sausage. What would you like to substitute it with?
Instead of sausage you can tell them to use pepperoni.
Okay, I added in the notes to replace sausage for pepperoni.
Perfect! What's the total?
Your total is $15.95 which is being charged on your Visa. 
Thanks for the response
To repeat. I placed an order at Eagle Pizzeria for a Medium Pizza with green peppers and pepperoni. The pepperoni replaces the sausage and your total comes down to $15.95. This will be charged on your visa that is currently associated with your account.
That sounds right, it's okay to submit.
I do apologize it seems that they are now out of green peppers.
Okay if they are out of green peppers you can replace that with pineapple.
Okay the updated order is: A medium Pizza. May replace green bell peppers for pineapple and sausage for pepperoni. In total your medium pizza with pineapple and pepperoni comes down to $15.95
Sounds, good. Give it a go.
I submitted your order. Your pizza order is complete and the pizzas will be ready for pickup in about 25 minutes.