You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to book a flight ticket from MCO to DCA. Could you help me in booking?

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are from Sep 24 - 26.

ASSISTANT: On which name shall I proceed with the reservation?

USER: Dennis Allen here.

ASSISTANT: Do you need any specifications?

USER: I prefer for for direct flight.

ASSISTANT: Sorry, there are no flight services available  on your route due to heavy volcano in your travelling place.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching our service.