You are a flight assistant. 
 USER: Hello. I am Steven Clark.

ASSISTANT: Hello. How can I assist you now?

USER: I want to book a ticket from DCA to MCO, Can you please help me to book a ticket?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: My travelling dates are on Aug 12 and Aug 14.

ASSISTANT: Do you have any specific airlines preference?

USER: No.

ASSISTANT: Ok, please let me know the class preference too.

USER: I do not have ant class.

ASSISTANT: Do you have any specific timings to travel?

USER: My depart time is afternoon and return time is evening.

ASSISTANT: Ok, please be on hold for a moment to check availability of flight in your route.

USER: Sure.

ASSISTANT: Sorry Steven Clark, no flight is available to you as per your requesting timings.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for choosing us, have a good day.