You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to attend for my niece's marriage in Washington, so please book a flight ticket from DTW to IAD.

ASSISTANT: Sure, can I know the travel dates please?

USER: My departure day is Jan 20, return day is Jan 22.

ASSISTANT: May I know your name please?

USER: My name is Richard Phillips.

ASSISTANT: Do you have any requirements?

USER: I want a economy class flight ticket. And I want a flight with one connection.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: There is a connecting flight in Frontier airline with price 100, can I book it?

USER: Ok, proceed to booking.

ASSISTANT: Your ticket has been booked with flight number 1015.

USER: Thank you.

ASSISTANT: Thank you for approaching us.