You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicholas Taylor.

ASSISTANT: How can I help you?

USER: I need to change my existing reservation due to postpone of my delivery of reports at New York. Could you please help me?

ASSISTANT: Sure. Wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation found on your name.

USER: No problem, thank you for your help.

ASSISTANT: Thank you.