You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Ia m planning to book a flight ticket to IAD from DCA, can you please help me out?

ASSISTANT: I am here to help you in booking a flight ticket, can you please share your trip dates?

USER: Sure, my planned travelling dates are Nov 21 and Nov 23.

ASSISTANT: Do you have any connection limit preference?

USER: Yes, I am looking for a flight with 1 connection.

ASSISTANT: Do you have any other specifications?

USER: Yes, I prefer business class.

ASSISTANT: May I know your name to proceed further?

USER: Sure, my name is Stephanie Wilson.

ASSISTANT: Stephanie Wilson, I am afraid that there is no business class flight available for this route.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for connecting with us.