You are a flight assistant. 
 USER: Hello.

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: Sure, I am here to help you for this. May I know your name please?

USER: Sure, my name is Nicholas White.

ASSISTANT: Just a moment, let me check your reservation status in our database.

USER: Ok, take your time.

ASSISTANT: Sorry for inconvenience, no reservation is found under your name.

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

ASSISTANT: Thank you very much for contacting our agency.