You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how my help you?

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

ASSISTANT: Sure, please tell me your trip dates.

USER: The trip dates are 02/16 to 02/18.

ASSISTANT: Sure, may I know your source and destination codes?

USER: The source code is from NC-CLT and the destination airport code is CA-OAK.

ASSISTANT: Ok, could I know your name please?

USER: Sure, my name is Richard Lewis.

ASSISTANT: Sorry, there is no plane on your requested travelling dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: My pleasure, have a nice day.