You are a flight assistant. 
 USER: Hello, I am Justin Green.

ASSISTANT: Hello, how may I assist you today?

USER: I need to fly from BOS to DCA, can you please help me to book a flight ticket?

ASSISTANT: Sure, can you please provide your journey dates?

USER: Sure, my journey dates are Dec 08 and Dec 10.

ASSISTANT: Do you have any restrictions to be met?

USER: I need a halt. And I prefer a departure time at Afternoon.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: We have found a connected flight of Delta airline, flight number-1018 departure time- afternoon and fare is 100. Would you like me to proceed?

USER: Yes, please proceed.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for availing us.