You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, let me know your travelling dates?

USER: My travelling dates are from July, 20 to July, 22.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: Dorothy Young.

ASSISTANT: We found a Delta airline with flight number 1013 and fare 100 with class is economy. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us.