You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Dennis Mitchell.

ASSISTANT: How may I assist you today?

USER: Can you please make a airline reservation from DEN to PHL?

ASSISTANT: Sure, may I know your travelling dates, please?

USER: My journey dates are on Aug 10th and 12th.

ASSISTANT: Please hold a moment, let me check best flight for your journey.

USER: My return flight time is Morning. I need a connecting flight. Sure.

ASSISTANT: Sorry, there are no flight tickets available as per your requirement.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching our service.

USER: Thank you.