You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to attend a Seminar in New York. Can you please help me for booking the flight ticket?

ASSISTANT: Ok, can you please provide your airport codes?

USER: My airport codes are SFO and EWR.

ASSISTANT: On which dates you are planning to taavel?

USER: My travelling dates are Oct 31 and Nov 02.

ASSISTANT: Do you have any requirements?

USER: I need nonstop flight.

ASSISTANT: May I know your name please?

USER: I am Brandon Rodriguez.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Anyway, thanks for the information.

ASSISTANT: Most welcome.