You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to visit Washington in direct flight with business class, will you help me in booking?

ASSISTANT: Ok, please can I know the dates of your journey?

USER: My travelling dates are Oct 02 and Oct 04.

ASSISTANT: Ok, please can I know the codes of your airport?

USER: My airport codes are DE to DCA. My origin airport code is DEN.

ASSISTANT: Please can I know your specification?

USER: I have already mentioned.

ASSISTANT: I mean please let me know if you need anything else.

USER: No, thank you for asking.

ASSISTANT: Sorry, there are no flights available as per your intents.

USER: Myself Stephen Edwards.

ASSISTANT: But there is a economy class flight available. Can I book?

USER: Ok, not an issue. Don't proceed with the booking.

ASSISTANT: Ok, thank you for choosing our agency.

USER: Thank you for your information.