You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. how may I help you?

USER: Can you please help me in booking my flight ticket from DCA to SFO?

ASSISTANT:  Sure, may I know your travelling dates?

USER: My travelling dates are Dec 23 and Dec 25.

ASSISTANT:  On which name shall I reserve flight ticket?

USER: Myself Raymond Thompson.

ASSISTANT:  Do you need any specifications?

USER: I need my depart ticket at evening time.

ASSISTANT: Please wait a moment, let me check best flight for your journey.

USER: Ok.

ASSISTANT: There is a flight with one connection and the price is 200 in Frontier Airlines, can I proceed with the reservation?

USER: Please proceed with booking.

ASSISTANT:  Your ticket has been reserved with the flight number 1000.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing our service.