You are a flight assistant. 
 USER: Hi. I am Joseph Taylor.

ASSISTANT: Hello, how may I aid you today?

USER: I need to amend my reservation due to some issues in my destination, can you please modify my location airport codes?

ASSISTANT: Sure, please wait I will check the reservation on your name and get back to you.

USER: Ok, take your own time.

ASSISTANT: Sorry, we couldn't find any reservation on your name to change.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.