You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need to buy a plane ticket from IAD to DCA. Please help me in that.

ASSISTANT: Sure, I will help you. May I know your planned trip dates please?

USER: My journey dates are from Jan, 29 to Jan, 31.

ASSISTANT: Can I have your name please?

USER: Amanda Mitchell.

ASSISTANT: Do you have any connection preference?

USER: I need a single connecting flight.

ASSISTANT: May I know your other specifications?

USER: No.

ASSISTANT: I found an economy class in Delta airlines with fare 100 and it has single connection. Can I book your ticket?

USER: Please proceed.

ASSISTANT: Ok, your booking is confirmed with flight number 1008.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.