You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a flight ticket from OAK to DEN. Can you help me in booking a flight ticket?

ASSISTANT: Sure, can you please share your planned trip dates?

USER: Sure, my journey dates are Sep 25 and Sep 27.

ASSISTANT: Do you have any connection limit?

USER: I need a connected flight.

ASSISTANT: Any other requirements to be met?

USER: No.

ASSISTANT: May I know your name?

USER: Sure, Jonathan Nelson here.

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

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for opting us.