You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you help me to reserve a flight ticket from DTW to DEN?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: I am Timothy Lopez.

ASSISTANT: Please help me with your planned travelling dates.

USER: My travelling dates are 07 to 09 of Mar.

ASSISTANT: Do you need a break in between your journey?

USER: I need a direct flight.

ASSISTANT: Do you have any other preferences in your journey?

USER: No.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Timothy Lopez, I am really sorry to inform you that there are no flights available for your journey.

USER: It's ok, not a probelm, thank you.

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