You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Barbara Carter.

ASSISTANT: How can I help you?

USER: On this weekend I would like to visit National Mall located in Washington.

ASSISTANT: That's nice.

USER: Can you please help me in booking a ticket from DTW to IAD?

ASSISTANT: Sure, please provide your travelling dates.

USER: The dates are from 04/21 to 04/23.

ASSISTANT: As per your request, there is a flight with price 100 and the connections 1 is available. Shall I proceed for booking?

USER: Yes, that matches with my requirements. Please book the ticket.

ASSISTANT: Your ticket is booked.The flight number 1018.

USER: Ok, thank you for booking a flight ticket.

ASSISTANT: Welcome, have a great day.