You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please change my existing reservation as my plan to attend a flower festival got postponed?

ASSISTANT: Sure, can I know your name please?

USER: I am Charles Robinson.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.