You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your service today?

USER: I need to book a ticket from DCA to PHX. Could you book a ticket?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Travelling dates are from Apr, 28 to Apr, 30.

ASSISTANT:  Do you prefer any stopover in between journey?

USER: I would be comfortable with single stop over.

ASSISTANT: Do you have any other specifications?

USER: I would like to depart in the evening.

ASSISTANT: Please help me with your name for booking.

USER: George Evans.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 100 with flight number 1018. Shall I proceed with this flight?

USER: Please book a ticket.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Thank you for choosing us.