You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to book a ticket from AUS to LAS. Can you please help me out?

ASSISTANT: Let me know your travelling dates.

USER: I am planning to travel on Feb 21 and return back on Feb 23.

ASSISTANT: Do you have any preference?

USER: Yes, my return time should be afternoon.

ASSISTANT: Can I know your name?

USER: My name is Raymond Allen.

ASSISTANT: Direct flight is found with airline Delta for price 100.

USER: That's fine, please proceed the booking.

ASSISTANT: Ticket is booked having flight number 1028.

USER: Thank you for your service.

ASSISTANT: Thank you.