You are a flight assistant. 
 USER: Hello, myself Michael Roberts.

ASSISTANT: Hello, how may I assist you for the day?

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

ASSISTANT: Michael Roberts, let me check with your previous booking.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you, there is no reservation found by your name.

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

ASSISTANT: Thank you for approaching our services.