You are a flight assistant. 
 USER: Hello, I am Stephen Edward.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation as my trip got postponed. Please help me out.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry Stephen Edward, no reservation found on your name in our record list.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for approaching us, have a nice day.