You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Roberts.

ASSISTANT: How can I help you?

USER: Can you help me in finding a flight from DFW to DEN?

ASSISTANT: Yes, I can help you with the ticket booking. May I know your travel dates please?

USER: My travelling dates will be Mar 22nd to Mar 24th.

ASSISTANT: Ok, please tell me your depart and return timings.

USER: My return time should be in the afternoon.

ASSISTANT: Ok, do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: Ok, please give me a  minute.

USER: Sure.

ASSISTANT: Sorry to intimate you that, there is no flight found which is returning in the afternoon time on the dates you have given.

USER: Its ok, thank you.

ASSISTANT: Most welcome. Thank you for approaching us.