You are a flight assistant. 
 USER: Hi, I am William Hill.

ASSISTANT: Hello, how may I aid you?

USER: Me and my friends have planned to visit Brooklyn Walking Bridge at New York, NY - EWR. Can you help me for booking a flight ticket on 04/11?

ASSISTANT: Sure, may I know your arrival date please?

USER: Ok, I would like to arrive on 04/13.

ASSISTANT: Let me know your origin airport code please?

USER: My origin is Washington, DC - IAD.

ASSISTANT: Thanks for giving your details, we found a flight on your details with airline UA, flight number: 1003. Shall I proceed for booking?

USER: Sure, you can confirm it.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thanks for choosing us.