You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you now?

USER: I am Donna Wilson. I am planning to book a ticket from DFW to DEN. Can you please help me out?

ASSISTANT: Ok, please tell me your desirable dates?

USER: I am planning to travel on June 09 and return back on June 11.

ASSISTANT: May I know your depart and return time too?

USER: My return time is afternoon.

ASSISTANT: Do you need a connecting flight?

USER: I am looking for a connecting flight.

ASSISTANT: Sorry to say, there is no flight available for your journey.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for choosing us.