You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I planned to meet my cousin in ORD, can you please help me to book a flight ticket from SFO?

ASSISTANT: Sure, can I know your travelling dates?

USER: I prefer to travel on Dec 3 and Dec 5.

ASSISTANT: Do you have any connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT: On which name should I reserve the flight ticket?

USER: Gregory Green.

ASSISTANT: Which class do you prefer?

USER: I prefer to travel in business class.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.