You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit Denver, will you help me in booking the flight ticket from JFK to DEN?

ASSISTANT: May I know your desired travel dates please?

USER: My travelling dates are Apr 12 and Apr 14.

ASSISTANT: May I know your name please?

USER: Myself Jack Robinson.

ASSISTANT: Can I know your connection limit please?

USER: I need a connecting flight.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Can you please check with my  depart time it must be in morning.

ASSISTANT: There is no flight on your preferred travel dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.