You are a flight assistant. 
 USER: Hello, myself Brandon Jones.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, if the reservation is there, I can change you reservation. Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Thank you. Sorry there is no reservation on your name.

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

ASSISTANT: Thank you.