You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Jason Thomas. Can you please help me in booking my flight ticket from ORD to ORD?

ASSISTANT: May I know your travel dates?

USER: My travelling dates are 03/21 and 03/23.

ASSISTANT:  Do you have any preference?

USER: I need direct flight.

ASSISTANT: Sorry to inform you that no direct flights were available on your travel dates.

USER: Ok, fine thank you for checking.

ASSISTANT:  Thank you for availing us.