You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I am Katherine Baker. I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please hold a moment. Thank you for your time, unfortunately no reservation found with provided name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.