You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Can you book a flight ticket from ORD to AUS to attend my sister's marriage?

ASSISTANT: Sure, On which dates would you like me to book a flight ticket for you?

USER: I will start on Dec, 27 and return on Dec, 29.

ASSISTANT: On what name, do I need to reserve your ticket?

USER: Donald Young.

ASSISTANT: Let me know your connection limit?

USER: I would prefer direct flight.

ASSISTANT: Do you have any other requirements?

USER: I need to depart at evening time.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure, take your time.

ASSISTANT: There is a direct flight with ticket fare 200 in Delta airlines in economy class, depart time is 21 hours. Is it ok for you?

USER: Please proceed.

ASSISTANT: Your ticket has been reserved with flight number 1021.

USER: Thank you.

ASSISTANT: Thank you for choosing us.