You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Amanda Wright. I would like to change my existing flight ticket from CLT to PHL. Could you please help me out?

ASSISTANT: Sure, please hold on for a moment. I am sorry, there are no reservations with your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you, have a good day,.