You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am Raymond Carter. I want to change my existing reservation, due to heavy rainfall in Seattle, can you help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that, we couldn't find any reservation on your name.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.