You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, please share your planned travel dates?

USER: My travel dates are May 26 to May 28.

ASSISTANT: Can I have your name please?

USER: My name is Paul Harris.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection of flight.

ASSISTANT: Any other requirements to be met?

USER: I prefer business class.

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

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.