You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket from ORD to SFO, can you please help me?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I planned my journey on the dates Sept 15 and Sept 17.

ASSISTANT: May I know your connection limit?

USER: I am happy with any connection.

ASSISTANT: Do you have any other specifications?

USER: Yes, I prefer business class for my journey.

ASSISTANT: Your good name please.

USER: Myself Richard Collins.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us.