You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I best serve you today?

USER: I am Brandon Jackson.

ASSISTANT: Thanks for providing your name.

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

ASSISTANT: Sure, I can change your reservation right now.

USER: Thank you.

ASSISTANT: Just give me a moment please.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

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

ASSISTANT: Thanks for reaching us, wish you a happy day.