You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you today?

USER: I am Carol Baker, I want to change my existing reservation please help me out.

ASSISTANT: Sure, we are here to help you. Please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: That's fine. Thank you.

ASSISTANT: Thank you for availing our agency.