You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I need to book a flight ticket from DEN to OAK to meet my friend.

ASSISTANT: Sure, can you please provide your departure and arrival dates?

USER: My journey dates are Aug 09 and Aug 11.

ASSISTANT: Do you have any restrictions to be met?

USER: I need a direct flight.

ASSISTANT: Are you looking for any preferred class?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: We have found a direct flight of American airlines, flight number-1006 class-economy and fare is 100. Would you like me to proceed?

USER: Go ahead.

ASSISTANT: Can I have your name to proceed further?

USER: I am Gregory Miller.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.