You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to book a flight ticket from DFW to LAS to meet my friends. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, can you please mention your departure and arrival dates of your journey?

USER: My travelling dates are Aug 5 and Aug 7.

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

USER: I need a lay by in between the journey.

ASSISTANT: Is there any other specifications regarding your journey?

USER: I prefer to return in the afternoon.

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

USER: I am Mark Hall.

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

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.