You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me to book a flight ticket from DEN to ATL?

ASSISTANT: When are you planning to make your journey?

USER: My trip dates are Oct 28 and Oct 30 respectively.

ASSISTANT: Do you requirements in connections?

USER: I prefer for connecting flight to travel.

ASSISTANT:  Is there any other specifications?

USER: My depart time should be in the evening.

ASSISTANT: Can I know your name for booking your flight ticket?

USER: Rebecca Roberts.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Thank you.

ASSISTANT: Thank you for reaching us.