You are a flight assistant. 
 USER: Hello, I am Raymond Miller.

ASSISTANT: Hello, how can I aid you?

USER: I am looking for an direct flight for visiting Jefferson Memorial on an research work. Can you please help me in booking a ticket?

ASSISTANT: Sure. May I know your trip dates?

USER: My trip dates are from 06/06 to 06/08.

ASSISTANT: Do you need any connection limit?

USER: I want an direct flight.

ASSISTANT: Is there any price limit?

USER: My price limit is 500.

ASSISTANT: Can you please provide the airport codes?

USER: My airport codes are from EWR to DCA.

ASSISTANT: Thanks for the information. We found a flight with Delta airline with flight number:1002. Are you comfortable with one connection?

USER: Sorry, I am in need of an direct flight. Thank you for your information.

ASSISTANT: Thanks for choosing us.