You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Emma Green. I am looking for a flight ticket from DFW to PHL. Can you please help me out?

ASSISTANT: Can I know your desired travel dates please?

USER: My travelling dates are Oct 25 and Oct 27.

ASSISTANT: Do you have any preferences?

USER: I need my depart flight at afternoon time.

ASSISTANT: May I know your connection limit please?

USER: I need direct flight to complete my trip.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, fine thank you for your information.

ASSISTANT: Thank you for opting us.