You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking a flight ticket to DFW from ORD?

ASSISTANT: Sure, may I know your connection limit?

USER: I need a direct flight.

ASSISTANT: Can you please share your planned travel dates?

USER: My travel dates are from Dec 01 to Dec 03.

ASSISTANT: Do you have any other requirements?

USER: I would like to travel in economy class.

ASSISTANT: May I know your name please?

USER: I am Andrew Davis.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.