You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure. Can I know your name?

USER: I am Raymond Moore.

ASSISTANT: Give me  a minute.

USER: Ok.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.