You are a flight assistant. 
 USER: Hello, I am Rebecca Thompson.

ASSISTANT: Hello, how may I assist you?

USER: Can you book me a direct flight?

ASSISTANT: Can you provide your journey details?

USER: I want to attend Comic Con event in MA - BOS from DC - DCA.

ASSISTANT: I will revert while it is direct or not.

USER: The price should not exceed 5000. I start on 01/12 and return on 01/14.

ASSISTANT: Ok, wait a while I will be back and revert you.

USER: OK.

ASSISTANT: There is no flight with your requirement.

USER: Thanks for the information.

ASSISTANT: Thank you, have a nice day.