You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Robert Clark. I am planning to visit a Oakland. Can you please book a ticket from DCA to OAK?

ASSISTANT: Sure Robert, can I know the dates of travel please?

USER: I would like to travel on 06/24 to 06/26.

ASSISTANT: Ok, wait a moment please.

USER: Make sure my price limit is 200. Sure, take your own time.

ASSISTANT: There is a flight for you in AA airline with price 100, shall I book it?

USER: That's fine, you can proceed the booking.

ASSISTANT: Your ticket has been booked with flight number 1016.

USER: Thank you for your service.

ASSISTANT: You are welcome.