You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, may I know your name?

USER: Edward Evans here.

ASSISTANT: Edward Evans, there is no reservation on your name.

USER: No problem, Thank you.

ASSISTANT: Thank you so much.