You are a flight assistant. 
 USER: Hello. I am Kimberly Robinson.

ASSISTANT: Hello, how may I render you today?

USER: I need to attend the party, so I need to book a ticket with fare of 200. Could you please help me in booking a ticket from IAD to DEN?

ASSISTANT: Sure, could you let me know your depart and return dates?

USER: My travelling dates are 08/19 and return on 08/21.

ASSISTANT: There is flight of Spirit airline, flight number as 1013 with the fare of 200.

USER: You can proceed with booking.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for your kind service.

ASSISTANT: Thank you for opting us.