You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I would like to book a flight ticket from CA to visit Olympic National Park in DC, can you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, can you share your trip dates?

USER: Sure, I need to depart on 12/18 and my return date will be on 12/20.

ASSISTANT: What is your destination?

USER: My landing airport code is IAD.

ASSISTANT: Do you need any connections?

USER: I have already mentioned above.

ASSISTANT: Are there any other preferences?

USER: No more specifications.

ASSISTANT: May I know your name?

USER: I am Joshua Davis.

ASSISTANT: Direct flight number 1015 with price 100 in economy class is available. Is it ok?

USER: Ok, please proceed with the booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your assistance in booking.

ASSISTANT: Thank you for reaching us.