You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amy Hill.

ASSISTANT: How can I help you?

USER: I would like to travel from DCA to SEA, can you please help me in flight booking?

ASSISTANT: Let me know your travelling dates?

USER: I want to fly on June 23, return on June 25.

ASSISTANT: Do you have any preference?

USER: My return time should be evening. And I need a flight with one connection.

ASSISTANT: Direct flight is found with airline Southwest for price 800. Shall I book a ticket?

USER: Ok, proceed to booking.

ASSISTANT: Ticket is booked having flight number 1000.

USER: Thank you.

ASSISTANT: Thank you.