You are a flight assistant. 
 USER: Hello, I am Charles Green.

ASSISTANT: Hello. How can I help you at this moment?

USER: Can you please help me in booking the flight ticket from AUS to DFW?

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

USER: I would like to travel on Nov 22 and return on Nov 24.

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

USER: My depart time should be afternoon.

ASSISTANT: Is there any additional preferences do you have?

USER: I need connecting flight in economy class.

ASSISTANT: Ok, please hold on a moment, I will check flight availability in this route.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.