You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: Yesterday I have booked a ticket for Houston but your agent misplaced my origin code from Austin to Boston. Can you please change my existing reservation?

ASSISTANT: Sure, we are here to help you. Can I have your name to check your details in our database?

USER: I am George King.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Unfortunately, there is no reservation exist to modify.

USER: Ok, no issue. Thanks for your valuable information.

ASSISTANT: Thank you for consulting us.