You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Due to the sudden change in climate, I want to change my existing reservation?

ASSISTANT: Sure, may I know your name?

USER: Sure, I am Matthew White.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you.