You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Cynthia Scott. I would like to change my existing flight ticket. Could you help out?

ASSISTANT: Sure, I am here to help you.

USER: Glad to hear that.

ASSISTANT: Sorry Scott, there is no reservation found as per your name to change your reservation in your database.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: You are welcome always.