You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can help you today?

USER: My name is Christopher Carter. I want to change my existing reservation due to heavy rain fall at my destination. Can you please help me with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check your previous reservation status.

USER: Sure.

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

USER: OK, no problem. Thanks for your information.

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