You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Jessica Harris, I want to change my reservation as I need a flight with cheaper flight ticket from existing reservation. Can you change my reservation with fare of 200?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Thank you for the information.

ASSISTANT: Thank you for reaching us.