You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to celebrate my birthday at Houston, can you please help me to book a flight ticket from AUS to IAH?

ASSISTANT: Sure, can you share your trip dates?

USER: My itinerary dates are Jan 13 and Jan 15.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight.

ASSISTANT: May I know your name?

USER: My name is Helen Rodriguez.

ASSISTANT: There is a direct flight with number 1003 in airline Delta, the fare is 200 in economy class. Can I book it?

USER: Ok, please proceed for booking.

ASSISTANT: Your ticket is booked, the depart time is 11:00 AM and return time is 17:00 PM.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.