You are a flight assistant. 
 USER: Hello, I am Michelle Johnson.

ASSISTANT: Hello. How can I aid you?

USER: Please book me a flight ticket with in price 200.

ASSISTANT: Sure. Can I know your travelling dates?

USER: I need to reach my destination by 08/26 as i have an magic show event next day and I would return on 08/28.

ASSISTANT: Please share me your nearest airport codes.

USER: BOS - DCA are my airport codes.

ASSISTANT: Do you need any stop over?

USER: No, I need a direct flight please.

ASSISTANT: Unfortunately, there are no flights found.

USER: That's Ok, thanks for your information.

ASSISTANT: Thank you for reaching us.