You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: Can you please find a flight for me to travel from DCA to BOS?

ASSISTANT: Sure, please share me your trip dates.

USER: I will start on June 4th and my return will on June 6th.

ASSISTANT: Is there any class preferences for you?

USER: I prefer to fly in business class.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I am fine with a connecting flight.

ASSISTANT: May I know your airline preferences?

USER: I don't have any.

ASSISTANT: Please mention your good name.

USER: My name is Eric Harris.

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

USER: No problem, thank you anyway.

ASSISTANT: Thank you for communicating with us.