You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Nicholas Harris, I want to change my reservation to save some money. Can you change my reservation to get a new flight under fare of 200?

ASSISTANT: Sure. Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your  time. We didnt found any reservation by this name.

USER: Thank you for the information.

ASSISTANT: Thank you for choosing us.