You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Robert Parker, I need to change my reservation due to ill health. Can you please help me with that?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Parker, there is no reservation found on your name.

USER: Not a problem, anyways thank you for the help.

ASSISTANT: Thank you for approaching us.