You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to book a flight ticket to DEN from JFK, can you please help me out?

ASSISTANT: Can I know your travelling dates?

USER: Sure, my trip dates are Nov 28 and Nov 30.

ASSISTANT: Do you have any preference?

USER: I am looking for a flight with 1 connection.

ASSISTANT: Please provide your name?

USER: Sure, my name is Katherine Robinson.

ASSISTANT: Sorry, currently there are no flights for your travelling dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you.