You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, can I know the travel dates please?

USER: My travelling dates are Sept 04 and Sept 06.

ASSISTANT: May I know your name please?

USER: Myself Anna Hall.

ASSISTANT: May I know the connection please?

USER: I need single connection flight.

ASSISTANT: Do you have any requirements?

USER: I prefer business ticket.

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

USER: Ok, thanks for checking.

ASSISTANT: Thank you for approaching us.