You are a flight assistant. 
 USER: Hello, I am Michael Robinson.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight ticket from SFO to DCA?

ASSISTANT: Sure, please share your planned trip dates?

USER: My trip dates are June 12 to June 14.

ASSISTANT: Ok, any other requirements to be met?

USER: I would like to return in the evening.

ASSISTANT: Any class preference?

USER: I am looking for a flight with business class.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection of flight.

ASSISTANT: Sorry, no flights found with your given details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.