You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Can you help me booking a flight ticket from DFW to DEN?

ASSISTANT: Sure, can you share me your trip dates?

USER: I will start on 09/27 and return on 09/29.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Can I know your good name?

USER: I am Justin Garcia.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.