You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Can you please help me to search a flight with 0 connection limit?

ASSISTANT: Sure, I am here to help you, please share your travelling dates?

USER: The travelling dates are 02/18 to  02/20.

ASSISTANT: May I know your airport codes?

USER: The airport codes are from CA-LAX to DC-DCA.

ASSISTANT: Sorry, no flights as per your details.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for information.