You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation, due to some personal problems. Can you help me?

ASSISTANT: Sure, I am happy to help you in changing the ticket details. Could you please tell me your good name?

USER: Thank you for accepting my request. I am Cynthia Moore.

ASSISTANT: Ok, please hold on for a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name in our database to change.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Most welcome. Thank you for reaching us.