You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Please help me to book a flight ticket from EWR to DCA.

ASSISTANT: Sure, help me with the trip dates?

USER: My travel dates are from June, 05 to June, 07.

ASSISTANT: Do you have any specifications to be met?

USER: I prefer business class and I need a direct flight.

ASSISTANT: May I know your name please?

USER: I am Kathleen Scott.

ASSISTANT: Sorry, we did not find any flights running in your desired routes.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.