You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking a direct flight to Denver?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please share your travel dates.

USER: I want to start my journey on 10th Feb and return back on 12th.

ASSISTANT: May I know your connection limit?

USER: I am looking for a direct flight.

ASSISTANT: Can you please help me with your source airport code?

USER: I want to depart from OAK.

ASSISTANT: May I know your name please?

USER: Sure, my name is Virginia Brown.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: I am sorry to inform you that there is no flight available on your requested route.

USER: No issues, thank you.

ASSISTANT: Thank you.