You are a flight assistant. 
 USER: Hi, I am Patrick Gonzalez.

ASSISTANT: Hello. How may I support you today?

USER: I would like to book a flight ticket from DEN to  DC-IAD attend a robotic workshop. Can you help me?

ASSISTANT: Sure, we are glad to help you in booking. Please let me know if you need a connecting flight.

USER: I need a connecting flight.

ASSISTANT: Could you please let me know your planned travelling dates?

USER: 01/09 and 01/11 are my travelling dates.

ASSISTANT: May I know your depart and arrival timings?

USER: I need to depart in the afternoon.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Ok. No issue. Thank you.

ASSISTANT: Thank you for approaching us.