You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

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

ASSISTANT: Sure, may I know your name?

USER: My name is Margaret White.

ASSISTANT: Sorry, there is no reservation on your name.

USER: That's ok. Thanks for the information.

ASSISTANT: You are welcome.