You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you at present?

USER: Could you please help me to book a flight ticket from DCA to BOS?

ASSISTANT: Sure, may I know your connection limit please?

USER: I need a single connecting flight.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I want to travel on Feb 24 and return on Feb 26.

ASSISTANT: On what name, do I need to reserve the ticket?

USER: I am Carol Moore.

ASSISTANT: Are there any other specifications?

USER: I prefer a business class.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for availing us.