You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to visit a college annual day  in DFW from JFK, can you find a ticket for me?

ASSISTANT: Yes, could you tell me your travelling dates?

USER: Sure, my departure date is 08/08 and the arrival date is 08/10.

ASSISTANT: Sorry, there is no flight found matching your requirement. Sorry for the inconvenience.

USER: OK, no problem.

ASSISTANT: Can I know your name for documentation purpose?

USER: Sure, I am Karen Brown.

ASSISTANT: Thank you for details.

USER: Thank you for your help.