You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at present?

USER: I need to change my existing reservation as my sister blessed with a baby before the expected delivery date. Can you please help me with this?

ASSISTANT: Sure, we are here to help you to change it. To proceed further, may I know your name?

USER: Ok, I am John Edwards.

ASSISTANT: Ok, please wait for sometime.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name to change it.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for approaching us.