You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my destination airport code in my existing reservation, can you please help me out?

ASSISTANT: Sure, may I know your name to fetch your details from our database?

USER: Sure, my name is Brian Brown.

ASSISTANT: Thank you for providing your name, we regret to inform you that there is no reservation found on your name.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for contacting us.