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 PHL, can you help me in booking a flight ticket?

ASSISTANT: Sure, please share your planned travel dates?

USER: Sure, my journey dates are Oct 20 and Oct 22.

ASSISTANT: Do you have any connection limit?

USER: I prefer maximum one connection.

ASSISTANT: Any class preference?

USER: I want to fly in a business class.

ASSISTANT: Any other requirements to be met?

USER: I would prefer return time at afternoon.

ASSISTANT: Can I have your name please?

USER: Sure, Justin Martinez here.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.