You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you now?

USER: I would like to change my existing reservation due to postpone of my seminar. Could you please help me?

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

USER: Sure, I am Larry Allen.

ASSISTANT: Ok, please wait for a while. I will check with it and get back to you.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there is no reservation available on your name as per our records.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.