You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: May I know your name please?

USER: Eric Nelson.

ASSISTANT: Please wait for while.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: Not an issue, thank you for the information.

ASSISTANT: Most welcome.