You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you today?

USER: I would like to change my recent reservation due to my meeting has been postponed to some another day, will you help me in changing my flight ticket?

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

USER: Myself Paul Moore.

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

USER: Ok, I will wait.

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

USER: Ok, not an issue. Thank you for your information.

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