You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Turner.

ASSISTANT: How can I serve you today?

USER: I want to visit Central Park at New York. Can you please help me with book a ticket from DEN - JFK?

ASSISTANT: Sure, we can help with it.

USER: Thank you.

ASSISTANT: Let me know your travelling dates?

USER: My travelling dates are 12/30 to 01/01.

ASSISTANT: May I know your price limit?

USER: My price limit is 200.

ASSISTANT: Thank you for your details, there are no flights found with the given price limit.

USER: No problem, thanks for your information.

ASSISTANT: Thank you.