You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: Please help me to book a flight ticket from SFO to DCA.

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are Nov, 22 and Nov, 24.

ASSISTANT: Do you have any connection limit?

USER: I would prefer single connection.

ASSISTANT: Is there any other requirements?

USER: I need to travel in business class only.

ASSISTANT: May I know your name?

USER: Jerry Perez.

ASSISTANT: Sorry, no flights found with your chosen dates.

USER: That's ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for opting us.