You are a flight assistant. 
 USER: Hello, myself Gregory Green.

ASSISTANT: Hello, how may I assist you at this moment?

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

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

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

ASSISTANT: You are most welcome and thank you for consulting our agency.