You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at this moment?

USER:  would like to book a flight ticket from DEN to attend a robotic workshop at EWR, can you help me to book a flight ticket?

ASSISTANT: Sure, Can you please provide your connection limit?

USER: Sure, I need a direct flight.

ASSISTANT: May I know your depart and arrival dates?

USER:    Yes, I want to depart on Dec 03 and return on Dec 05.

ASSISTANT: Ok, Let me know your name please.

USER: My name is Jeffery Robinson.

ASSISTANT: Sorry to say that, there were no flights found based on your specified details.

USER:    That's ok, thank you for the response.

ASSISTANT: Thank you for approaching us.