You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself George Nelson. Due to heavy rains, I want to change my existing reservation.

ASSISTANT: Ok, let me check your details.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no reservation on your name.

USER: Ok, that's fine.

ASSISTANT: Do you want anything else?

USER: No, thank you for your help.

ASSISTANT: Thank you, have a nice day.