You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

USER: Please help me out in booking the ticket from IAD to MSP.

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates will be May 24 to May 26.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Stephanie Clark is my name.

ASSISTANT: Is there any time concern for you?

USER: My depart time must be in the evening.

ASSISTANT: May I know your class preferences?

USER: Business class.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for availing us.