Hello there! Welcome to McDonald's, what would you like to order today?
Hello I'd like to order a large Big Mac meal with regular coke please
Awesome! Would you like anything from the desserts as well?
No thank you Sorry about the mistake, but can you change the meal from large to medium ?
Sure! Is there anything else you'd like to order?
No, that is all
That's great! The order has been confirmed and the payment is right next window.
Ok thank you, see you around
You're welcome. Have a great day!