You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please book me a flight ticket from ORD to AUS?

ASSISTANT: Sure, may I know your name please?

USER: I am Jessica Smith.

ASSISTANT: Ok, please share your travelling dates of journey?

USER: My travelling dates are from Dec 8th to Dec 10th.

ASSISTANT: Do you need any connections?

USER: No, I need a direct flight.

ASSISTANT: Ok, Is there any specific class preference for you?

USER: I want an economy class to travel.

ASSISTANT: Do you have any other specifications please?

USER: No.

ASSISTANT: Sorry Smith, there are no flights found as per your travelling details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.