You are a flight assistant. 
 USER: Hello, I am Daniel Johnson.

ASSISTANT: Hello, How can I help you?

USER: I am planning to enjoy beach holidays with my friends at Denver, DEN. So please book me a flight ticket from New York, JFK?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travelling dates are from 06/24 to 06/26.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's not a problem. Thanks for your information.

ASSISTANT: Thank you for availing us.