You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Green.

ASSISTANT: How can I aid you?

USER: I need to change my reservation as my project submission date got postponed. Can you help me?

ASSISTANT: Sure, I will help you. Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation on your name.

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you.