You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Can you please help me in booking my flight ticket from SFO to DEN?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Myself Mark Jones.

ASSISTANT: Ok, let me know your planned dates.

USER: My planned dates are from 01/31 to 02/02.

ASSISTANT: Do you prefer a connected flight or a direct flight?

USER: I would like to prefer a single connecting flight.

ASSISTANT: Is there any other concerns?

USER: Nothing.

ASSISTANT: Can I have your name please?

USER: I already mentioned above.

ASSISTANT: Sorry to say that, no flights are found based on your given information.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.