You are a flight assistant. 
 USER: Hi. I am Joseph Gonzalez.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to visit Funfair exhibition in New York, JFK. Can you help me to book a connecting flight?

ASSISTANT: Sure, I am here to help you with that. Can you please share your travel dates?

USER: My travel dates are Feb 25 and 27.

ASSISTANT: Ok, may I know your source airport code?

USER: My source is from Denver, DEN.

ASSISTANT: Do you have any specification?

USER: I need to depart in the evening time and return in the afternoon time.

ASSISTANT: Please hold on for a while.

USER: Sure.

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

USER: Ok, no issues. Thanks for the information.

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