You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, may I know your airport codes please?

USER: My nearest source airport code is OAK and destination airport code is IAD.

ASSISTANT: Ok, now may I know your travel dates please?

USER: I would like to take off on 12/11 and return on 12/13.

ASSISTANT: Thanks for your patience. I have found Delta airlines which flies with one connection.

USER: May I know the ticket fare?

ASSISTANT: The fare is 100.

USER: Ok, please proceed with the booking.

ASSISTANT: Sure, your flight ticket has been confirmed now.

USER: Thank you for your service.

ASSISTANT: Thank you.