You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I provide assistance to you today?

USER: Owing for an emergency, I want to change my reservation. Can you please help me?

ASSISTANT: Please wait for a moment, while I search for the reservation. May I know your name?

USER: The reservation was done on the name of Carol White.

ASSISTANT: We did not find any reservation by the name you mentioned above.

USER: No problem, thank you for checking.

ASSISTANT: Welcome, have a good day.