You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be your helping hand?

USER: I am Dennis Walker, can you help me to search a flight with 0 connection limit?

ASSISTANT: Sure, could you please provide your travelling dates?

USER: My travelling dates are 11/09 and 11/11.

ASSISTANT: Ok, may I know your codes of airport you want to travel?

USER: My prefer airport codes are OAK and DCA.

ASSISTANT: Sorry to say, no flights were found on your requested dates.

USER: That is fine.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your help.