You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from HOU to DCA. Can you please help me in that?

ASSISTANT: Sure, I am willing to help you for this. When would you like to travel?

USER: My trip dates are July 19 to 21.

ASSISTANT: Is there any criteria, regarding your journey?

USER: I need a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: There is a flight with United Airlines and the ticket fare is 400. Shall I proceed for this?

USER: You can proceed.

ASSISTANT: May I know your name please?

USER: Myself David Clark.

ASSISTANT: Your ticket is reserved in business class with the flight-1007. Your depart time is 9:00 Am and again your arrival time is 14:00 PM.

USER: Thank you for booking.

ASSISTANT: Thank you very much for contacting our agency.