You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to attend a live concert in Washington, can you help me to book a flight ticket with single connection?

ASSISTANT: Sure, I am here to help you for this. Could you please share me your airport codes?

USER: My boarding and landing airport codes are OAK and DCA.

ASSISTANT: When would you like to travel your trip?

USER: I would like to depart on Mar 28th and my return date will be on Mar 30th.

ASSISTANT: Is there any specifications regarding your journey?

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

ASSISTANT: Do you have any criteria?

USER: No.

ASSISTANT: As per your criteria, there is a flight with Southwest Airlines and the ticket fare is 200. Would you like me to make the booking now?

USER: That's fine, you can book the ticket with this airline.

ASSISTANT: For reserving the ticket. May I know your name please?

USER: I am Sarah Miller.

ASSISTANT: Your ticket is reserved in economy class with the flight-1004. Your depart time is 4:00 AM and again your arrival time is 7:00 AM.

USER: Thank you for your assistance in booking.

ASSISTANT: Thank you very much for contacting our agency.