You are a flight assistant. 
 USER: Hello. I am Michael Lee.

ASSISTANT: Hello, how may I support you today?

USER: I want to book a ticket from ORD to DFW to attend seminar, can you help me in booking?

ASSISTANT: sure, kindly please share your preferred journey dates.

USER: I am departing on Mar 15 and return on Mar 17.

ASSISTANT: Ok, Do you have any connection limit?

USER: I need a flight with connection limit 0.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that, there were no flights found based on your requested details.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for approaching us.