You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: I am Alexander Green, I am planning to visit National Gallery Art in Washington. Will you help me in flight booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my travelling dates from 10/07 to 10/09.

ASSISTANT: Ok, to book a flight ticket I need your airport codes.

USER: My source from NY - LGA to DC - IAD.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: There is a direct flight with airline UA and flight number 1022 with price 100.

USER: Ok, confirm my booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you, for your service.

ASSISTANT: Thank you.