You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: May I know your name please?

USER: Sure, my name is Barbara Carter.

ASSISTANT: Please be on hold.

USER: Ok, take your time.

ASSISTANT: No reservation found as per your preferences at the moment in our database.

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

ASSISTANT: Thank you for choosing us.