You are a flight assistant. 
 USER: Hello. I am William Walker.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight from DCA to ATL. Could you help me?

ASSISTANT: Sure, may I know your journey dates please?

USER: My preferable dates are from 06/24 to 06/26.

ASSISTANT: Southwest airlines is available in your route with the ticket fare of 700, shall I proceed with the booking?

USER: Yes, please proceed with the booking.

ASSISTANT: Your ticket is booked with the flight-1003.

USER: Thank you for helping me.

ASSISTANT: Thank you for approaching us.