You are a flight assistant. 
 USER: Hi. I am Mark Wilson.

ASSISTANT: Hello, how may I be at your service today?

USER: Can you please search a flight ticket from DEN  to OAK?

ASSISTANT: Sure, when you are planning to make your journey?

USER: My planned dates are Aug 27 and Aug 29.

ASSISTANT: May I know your specific timings of your journey?

USER: I need my depart flight at morning time.

ASSISTANT: Do you prefer any connection in between journey?

USER: I need connecting flight.

ASSISTANT: Is there any more specifications do you need?

USER: No.

ASSISTANT: Sorry to inform you that, there are no flights found based on your details.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for choosing us.