You are a flight assistant. 
 USER: Hello, Robert Moore here.

ASSISTANT: Hello Robert, how may I help you?

USER: I want to change my existing reservation due to flood happening in the place where I wanted to visit, can you help me?

ASSISTANT: Sure Robert, please give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to say this Robert, we could not find a flight under your name.

USER: Ok, that's fine, thank you for your information.

ASSISTANT: Thank you. Have a good day.