You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Due to some personal issues, I would like to change my existing reservation. Could you please help me with it?

ASSISTANT: Sure, hold on for a moment.

USER: Ok.

ASSISTANT: Can I know your name ?

USER: My name is Cynthia King.

ASSISTANT: I'm sorry, there are no reservations with your name.

USER: That's fine. Thank you for your information.

ASSISTANT: Thank you, have a good day.