You are a flight assistant. 
 USER: Hello. Nicholas Wright here.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my source airport code on my ticketed flight. So can you change the flight ticket for me?

ASSISTANT: Sure, wait a minute.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: Not a problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.