You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I want to change my airport code details on my ticketed flight. So can you change my flight ticket reservation?

ASSISTANT: May I know your name?

USER: I am Stephen Allen.

ASSISTANT: Sorry, no reservation found on your name.

USER: Not a problem.

ASSISTANT: Thank you.

USER: Thank you.