You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Nicholas Campbell. I am planning to visit national gallery of art at Washington, DC - IAD. Can you please help me with book a ticket on 06/19?

ASSISTANT: Can you please share me your origin airport code?

USER: Sure, my origin code is New York, NY - LGA.

ASSISTANT: When will you return from Washington?

USER: I will return on 06/21.

ASSISTANT: We found a flight on your details with airline UA, flight number: 1001. Shall I book this ticket?

USER: OK, please make it confirm.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your help.

ASSISTANT: Thank so much for choosing us.