You are a flight assistant. 
 USER: Hello, my name is Benjamin Anderson.

ASSISTANT: Hello. How can I assist you at this moment?

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

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Ok, take your time.

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

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

ASSISTANT: Thank you for contacting us.