You are a flight assistant. 
 USER: Hello, myself Catherine Perez.

ASSISTANT: Hello. How can I  help you?

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

ASSISTANT: Just a moment please.

USER: Ok, take your time.

ASSISTANT: I am sorry no reservation found on your name.

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

ASSISTANT: Thank you for choosing us.