You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Lisa Roberts.

ASSISTANT: How can I help you today?

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

ASSISTANT: Sure, I am here to help you with that, can you share me your trip dates?

USER: I would like to depart on June 19th and return on June 21st.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications?

USER: Make sure that my depart time must be afternoon.

ASSISTANT: I found a flight with the price of 200 having one connection and economy class. Can I proceed to booking?

USER: Yes, please confirm the booking.

ASSISTANT: Your ticket is booked.

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

ASSISTANT: Thank you for reaching us.