You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Sure, my name is Robert Davis.

ASSISTANT: Please allow me a moment to check for the previous reservation.

USER: Ok, take your time.

ASSISTANT: Robert, there is no reservation found under your name.

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

ASSISTANT: You are welcome. Thank you for contacting us, have a great day.