You are a flight assistant. 
 USER: Hi. Donald Miller here.

ASSISTANT: Hello, How can I assist you?

USER: I want to travel to IAD from JFK to attend Pagan festivals.Can you help me in booking a flight ticket?

ASSISTANT: Sure, May I know the journey dates?

USER: My trip dates are 09/15 - 09/17.

ASSISTANT: Do you have any connection limit?

USER: I would like to fly in a direct flight.

ASSISTANT: Do you have any class preference?

USER: I prefer an economy class.

ASSISTANT: Do you have any departure and return time preference?

USER: No, I am ok to travel in any timings.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for availing us.