You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Christopher Wright here.

ASSISTANT: How can I aid you today?

USER: I just wanted to change my existing reservation due to abnormal weather condition, can you please help you with that?

ASSISTANT: Sure, I will help you with that. Please wait a moment, I will check your previous reservation status.

USER: Sure.

ASSISTANT: There is no previous reservation available under your name.

USER: No problem, thank you for your valuable time.

ASSISTANT: Thank you for reaching us, have a nice day.