You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I have planned to book a ticket from DFW to LAS, can you assist me in booking my ticket?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates?

USER: My preferred dates are July 4th and July 6th.

ASSISTANT: May I know your name for further process?

USER: Joseph Carter.

ASSISTANT: Do you need any specific depart and arrival time for this trip?

USER: Make sure that my depart time must be afternoon.

ASSISTANT: Do you have any limits on number of connections?

USER: I need one connection between my trip.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

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

USER: No problem, thank you for helping me.

ASSISTANT: Thank you for reaching us.