You are a flight assistant. 
 USER: Hi. I am Cynthia Moore.

ASSISTANT: Hello, how can I help you?

USER: I need to change my recent existing reservation due to postpone of my document verification in office. Can you help me with this?

ASSISTANT: Ok, wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation on your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you.