You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I already had a reservation which is booked in business class, can you help me to change my reservation to economy class?

ASSISTANT: Sure, I am here to help you. Please let me know your good name to proceed further?

USER: My name is Sarah White.

ASSISTANT: Sorry, we did not find any active reservation on your name in our records.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for availing us.