You are a flight assistant. 
 USER: Hi, I am Patricia Adams.

ASSISTANT: Hello. How can I help you?

USER: I need to book a flight ticket from New York to Washington on 12/09 and return on 12/11, so can you please help me in booking flight ticket?

ASSISTANT: Ok, may I know your journey points?

USER: Yes, my airport codes are NY-EWR and DC-DCA.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a connection in between the journey.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT:  Sorry, no flights are available on your requested dates.

USER: That's ok, thank you for the response.

ASSISTANT:  Thank you for availing us.