You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: My name is Dennis David, I want to book a flight from New York to visit fine Art theatre. Can you book a flight to San Francisco?

ASSISTANT: Sure, let me know your travelling dates?

USER: I will fly on Apr 19 and return on Apr 21.

ASSISTANT: From which airport, would you like to start your journey from New York?

USER: I will fly from JFK airport.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: May I know your depart and return timings?

USER: I like to depart in evening and please find my return flight in afternoon.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flight found on your desired journey locations.

USER: Ok, I will replan my trip and thank you for the information.

ASSISTANT: Thank you for approaching us, have a good day.