You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Thompson.

ASSISTANT: How may I help you?

USER: I am planning to visit Millennium Park at Chicago, could you please help me with booking a flight ticket from DFW to ORD?

ASSISTANT: May I know your travel dates?

USER: I would like to take off on 03/19 and return on 03/21.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no flight found basis on your details.

USER: That's ok, I will find an another alternate way to complete my trip.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for the information.