You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to attend a Seminar in Chicago. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you. Can you please provide your airport codes of journey?

USER: My airport codes are DCA and ORD.

ASSISTANT: May I know your planned dates of journey please?

USER: My travelling dates are Apr 18 and Apr 20.

ASSISTANT: Do you have any connection limit preference?

USER: I prefer single connecting flight.

ASSISTANT: Do you have any other specifications for this trip?

USER: No, I don't have any other specifications.

ASSISTANT: May I know your name to proceed further?

USER: My name is Sarah Roberts.

ASSISTANT: United Airlines is providing direct flight on this route with a ticket fare of 100 and flight departs at 16:00 hours and arrives at 16:00 hours, shall I book your ticket in this flight?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Sarah Roberts, your ticket is booked in flight number 1026.

USER: Thanks for helping me.

ASSISTANT: You are welcome and have a safe journey.