You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kevin Williams.

ASSISTANT: How may I assist you at this moment?

USER: I would like to change the reservation as I am leaving to my hometown, can you please help me out?

ASSISTANT: Sure, I am gleeful to help you.

USER: Thank you.

ASSISTANT: Please wait a moment to check your previous reservation.

USER: Sure.

ASSISTANT: We regret to inform you that, there is no reservation on your name in our records.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us, have a great day.