You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I need to book a flight ticket from IAD to ATL to meet my friend, can you please book a flight ticket?

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

USER: My journey dates are Nov 29 and Dec 01.

ASSISTANT: Do you have any specifications to be met?

USER: I prefer a arrival time at evening.

ASSISTANT: Are you looking for any preferred class?

USER: No.

ASSISTANT: We have found a direct flight of Delta airlines, flight number-1013 class-economy and fare is 100. Shall I proceed with the booking?

USER: Go ahead.

ASSISTANT: May I know your name to proceed?

USER: I am Linda Roberts.

ASSISTANT: Sure, your ticket has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.