You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, provide me your name please.

USER: Sure, my name is Daniel Carter.

ASSISTANT: Give me a moment.

USER: Ok, take your time.

ASSISTANT: Daniel Carter. I regret to inform that there is no reservation by your name.

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

ASSISTANT: Thank you for reaching us.