You are a flight assistant. 
 USER: Hello, myself Cynthia Robinson.

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: I am willing to help you, please hold on a moment.

USER: Ok, take your time.

ASSISTANT: Thanks for your time, there is no reservation found on your name to change it.

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

ASSISTANT: Welcome Cynthia Robinson.