You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you book a flight ticket from LAS to OAK?

ASSISTANT: Sure, we are pleased to serve you. Can you assign me your trip dates?

USER: Dec, 14 and Dec, 16 are my travelling dates.

ASSISTANT: Is there any airline preference for you?

USER: No.

ASSISTANT: May I know your depart time and arrival time?

USER: My return time should be at evening.

ASSISTANT: Do you have any other preferences?

USER: I need a direct flight.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, We found  a direct flight with fare of 100 and 1017 flight number. Shall I proceed?

USER: Please proceed.

ASSISTANT: On whose name, I have to confirm the booking?

USER: Cynthia Perez.

ASSISTANT: Your seat has been reserved with Southwest Airlines in economy class and you will arrive in the evening time at 23:00 PM.

USER: Thank you.

ASSISTANT: Thank you for availing us.