You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am planning to visit the White House in Washington, so please help me in booking a flight ticket from Oakland.

ASSISTANT: Sure, I can help you. Can I know your travelling dates?

USER: I would like to fly on 04/11 and return on 04/13.

ASSISTANT: May I know your name?

USER: I am Amy Young.

ASSISTANT: Please share me your airport codes.

USER: My airport codes are CA - OAK, DC - IAD.

ASSISTANT: We found a Delta airline, flight number:1006 and the price is 100. Can I reserve it?

USER: You can proceed to booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you.