You are a flight assistant. 
 USER: Hi.

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

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

ASSISTANT: Sure, I am here to help you out. Please allow me a moment to check your reservation status on your name in our database.

USER: Sure.

ASSISTANT: Sorry Brandon Brown, there is no reservation on your name in our database.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.