You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Myself Joseph Baker. I need to change my existing reservation, can you please help me out?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment.

USER: Please take your time.

ASSISTANT: Sorry Joseph Baker, there is no reservation on your name in our database in our database.

USER: That's fine, thank you for searching the details.

ASSISTANT: Thank you for reaching us.