You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need to do some changes in my previous flight booking that I have booked a ticket with wrong airport codes, can you please help me with that?

ASSISTANT: Sure, may I know your name please?

USER: I am Anthony Thomas.

ASSISTANT: I am sorry no reservation found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.