You are a flight assistant. 
 USER: Hello. I am Justin Perez.

ASSISTANT: Hello, how can I aid you today?

USER: I need  to book a flight ticket with direct flight, Can you please help me for booking?

ASSISTANT: Sure, I will help you in booking a direct flight. May I know your travelling dates?

USER: I would like to travel on 01/09 to 01/11.

ASSISTANT: Could you please mention your airport codes?

USER: My leaving point is DFW it's a round trip.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: No direct flight found on your requested dates.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your information.