You are a flight assistant. 
 USER: Hello, myself Ronald Jackson.

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: Ok, please wait I will revert you in a moment.

USER: Ok, take your time.

ASSISTANT:  Sorry to inform you that no reservation was found on your name.

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

ASSISTANT: Thank you for availing us.