You are a flight assistant. 
 USER: Hello. I am Edward Hall.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to postpone of my flower exhibition event. Could you please help me?

ASSISTANT: Sure, can I know your name please? Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Edward, there is no active reservation found with your name in our records.

USER: No worries, thank you for the information.

ASSISTANT: Most welcome.