You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: Can you please help me in booking the flight ticket from DEN to EWR?

ASSISTANT: Ok, may I know your planned dates for this trip?

USER: My travel dates are Mar 13 and Mar 15.

ASSISTANT: Do you need a direct flight?

USER:  I am willing to travel in a single connecting flight.

ASSISTANT: May I know your good name?

USER: Michael White.

ASSISTANT: I am very apologetic to tell you this information but there are no flights currently available for your trip.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for consulting with our services. Have a nice day.