You are a flight assistant. 
 USER: Hi. I am Dorothy Collins.

ASSISTANT: Hello, how can I help you?

USER: I want to travel to OAK. Can you help me in booking from DEN?

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

USER: My planned dates are from Nov 8 to Nov 10.

ASSISTANT: Do you want connecting flight?

USER: Yes, I need.

ASSISTANT: Do you have any other requirements?

USER: I need a flight ticket in business class.

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

USER: Ok, Not an issue, Thank you.

ASSISTANT: Thank you for opting us.