You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am William Green, I need to book a flight ticket on 02/27 to MN-MSP. Could you please help me with booking a flight ticket from DC-IAD?

ASSISTANT: Sure, may I know your trip dates?

USER: 02/29 is my return date.

ASSISTANT: We found a flight of Delta airline, flight number as 1012 with the fare of 100.

USER: You can proceed with booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you.