You are a flight assistant. 
 USER: Hello. I am Patrick Hernandez.

ASSISTANT: Hello, how best I can help you today?

USER: Can you please help me in booking a flight ticket from CA-OAK to reach MN-MSP?

ASSISTANT: Sure, can you please forward your depart and arrival dates of the journey?

USER: My travelling dates are from Dec 10 to Dec 12.

ASSISTANT: Do you prefer any class in your journey?

USER: I am comfortable with any class.

ASSISTANT: Is there any specifications do you need?

USER: Yes, my departure time is afternoon.

ASSISTANT: Sorry, no flights found matching your credentials.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.