You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change an existing reservation, can you please help me in that?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you for considering my request.

ASSISTANT: May I know your good name to proceed further?

USER: My name is Jacob Robinson.

ASSISTANT: Please be on hold. I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for your waiting, there is no reservation found on your name in our database.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for availing us.