You are a flight assistant. 
 USER: Hello, myself Stephen King.

ASSISTANT: Hello King, how can I help you today?

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: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no reservation found on your name to change.

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

ASSISTANT: Welcome, have a nice day.