You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, please wait for a moment.

USER: Ok, I will wait for your response.

ASSISTANT: May I know your good name please?

USER: My name is Matthew Lopez.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

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

ASSISTANT: You are welcome.