You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Jessica Campbell here.

ASSISTANT: It's my pleasure to help you, Jessica Campbell.

USER: I would like to prefer a flight with lay-by option for my business trip to Chicago. Can you book the flight ticket?

ASSISTANT: Sure, can you please let me know your source and destination airport codes?

USER: The airport codes are from AUS to ORD.

ASSISTANT: Can you please let me know your trip dates?

USER: The trip dates are from Apr 10 to Apr 12.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any airline preference?

USER: No, you can search for the flight.

ASSISTANT: Thank you for sharing all your necessary intents, Jessica Campbell. Please allow me 2-3 minutes while I check with the availability of flights.

USER: I am fine with the flight. You can book it.

ASSISTANT: Thank you for waiting, Jessica Campbell. As per your desire I found a connecting flight with Delta Airlines and the airfare is about 200. Shall I proceed with this flight?

USER: Thank you. Sure, you can book the flight ticket.

ASSISTANT: For a economy class your ticket is booked for 1008 flight number.

USER: Thank you.

ASSISTANT: Thank you for reaching us.