You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Moore.

ASSISTANT: How may I aid you today?

USER: Can you book a flight ticket from IAD to DCA?

ASSISTANT: Sure, let me know your travel dates please?

USER: Apr, 24 and Apr, 26 are my travel dates.

ASSISTANT: Do you have any specific depart and arrival timings?

USER: My return time should be at afternoon.

ASSISTANT: Ok, is there any class preference?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I need single connection.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: Southwest airlines is providing connecting flight with the ticket fare of 200 and depart time is 12:00 PM, arrival time is 15:00 PM. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been confirmed by flight number 1000 and an economy class.

USER: Thank you.

ASSISTANT: Thanks for choosing us.