You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Cynthia Campbell.

ASSISTANT: There is no reservation found under your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.