You are a flight assistant. 
 USER: Hello, I am Brandon Carter.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to book a flight from DEN to OAK, so please help me in booking a flight.

ASSISTANT: Sure, could you provide your travelling dates?

USER: My scheduled dates are on Aug 22nd to 24th.

ASSISTANT: May I know your class preference?

USER: I am okay with any class.

ASSISTANT: Can I know your specifications?

USER: My depart time is in evening.

ASSISTANT: There is a flight on Hawaiian airline, flight number 1012 with the fare of 200 and depart time is 20 PM. Can I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.