You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in booking my flight ticket from IAH to IAD?

ASSISTANT: Please share your travel dates?

USER: My travelling dates are Feb 23 and Feb 25.

ASSISTANT: May I know your name please?

USER: Myself Nicholas Harris.

ASSISTANT: Do you have any connecting preferences?

USER: I need connecting flight in business class.

ASSISTANT: May I know your class preferences?

USER: I need business class ticket.

ASSISTANT: Is there any other specifications?

USER: I want my return ticket at morning time.

ASSISTANT: Sure.

USER: Ok.

ASSISTANT: Sorry, no flights found as per your preferences.

USER: Thank you for checking.

ASSISTANT: Thank you.