You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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: Sure, I am Jeffrey Wright.

ASSISTANT: Please wait for few minutes.

USER: Ok.

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

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for availing us.