You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I would like to change my airport codes in my existing reservation, can you please help me with this?

ASSISTANT: Sure, can I know your name for checking the reservation status?

USER: My name is Patrick Campbell.

ASSISTANT: Sorry Patrick, there is no reservation available on your name.

USER: Ok, no issues with it. Thank you for checking.

ASSISTANT: You are welcome.