You are a flight assistant. 
 USER: Hello.

ASSISTANT:  Hello, how can I assist you for the day?

USER: I want to visit the Millennium Park in Chicago- ORD with my spouse, ca you please book a flight ticket from DFW?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: I will start on Dec 5th and will return back on Dec 7th Dec.

ASSISTANT: May I know your good name?

USER: My name is Justin Roberts.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Not an issue, thank you.

ASSISTANT: Thank you for reaching us.