You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Steven White, I already book a flight to Washington for fare of 1000, I want a cheaper flight under fare of 200. Can you change my reservation?

ASSISTANT: Sure, we are here to help you. Please hold a moment, let me check your reservation and let you know.

USER: Sure.

ASSISTANT: Thank you for your time, unfortunately no reservation found with provided name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for approaching us.