You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, I am here to help you with that. May I know your name please?

USER: I am Gregory Wright.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting, but I am sorry to say that, there is no active reservation found on your name in our reservation list to change it.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us. Have a great day.