You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Samuel Roberts, planning to visit Charlotte. Can you please book me a ticket from DFW to CLT?

ASSISTANT: Ok, please provide me your journey dates for enhanced search.

USER: My preferable journey dates are from 07/31 to 08/02.

ASSISTANT: Please wait for a minute.

USER: Please search for direct flight on this route.

ASSISTANT: Roberts, there are no flights available at this moment.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thank you for choosing us, have a good day.