You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to book a ticket from LAX to DCA to attend seminar, can you help me in booking?

ASSISTANT: Sure, may I know your travel dates?

USER: I am departing on Dec 09 and return on Dec 11.

ASSISTANT: Please share me your name.

USER: My name is Joseph Martin.

ASSISTANT: Do you have any specifications?

USER: I prefer a connecting flight which depart in evening time.

ASSISTANT: We found a economy class flight with United airlines, flight number: 1006. Shall I book this ticket?

USER: Please proceed for booking.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for your help.

ASSISTANT: Thank you.