You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joshua Hill.

ASSISTANT: How may I assist you?

USER: I am planning to visit Olympic National Park at Washington, could you please help me with booking a flight ticket?

ASSISTANT: May I know your travel dates?

USER: I would like to take off on 12/02 and return on 12/04.

ASSISTANT: Where would you like to travel?

USER: My source airport code is DFW and destination airport code is IAD.

ASSISTANT: We found a flight on your details with airline AA, flight number: 1011. Shall I book this ticket?

USER: Please confirm the booking if the ticket fare is 200 or less.

ASSISTANT: Your ticket has been booked.

USER: I really appreciate your help, thank you for your service.

ASSISTANT: Thank you.