You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: How can I help you? My name is Samuel Campbell and I want to book the flight ticket from DEN to MSP. Can you please help me?

ASSISTANT: Sure, I will help you. Please help me with your planned travel dates.

USER: My travel dates are 11/13 and 11/15.

ASSISTANT: May I know whether you need a direct or connecting flight?

USER: I need a direct flight.

ASSISTANT: Please let me know with your preferred class of journey.

USER: I am comfortable with any class.

ASSISTANT: Please help me with your preferred depart and return time.

USER: I would like to depart in the evening.

ASSISTANT: May I know if you have any other preferences in your journey please?

USER: No.

ASSISTANT: Please allow me a minute of your time.

USER: Take your time.

ASSISTANT: Samuel Campbell, I am really sorry to inform you that there are no active flights as per preference.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us. Have a great time.