You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you at this moment?

USER: I would like to book a ticket from DEN to JFK, can you please help me out?

ASSISTANT: Sure, I am glad to help you with the ticket booking. Could you please tell me your journey dates to search the flight?

USER: I am travelling on these dates Jan 21st and 23rd.

ASSISTANT: Ok, do you have any specification about the connection limit?

USER: I need single connected flight.

ASSISTANT: May I know your name please?

USER: Kimberly Hernandez here.

ASSISTANT: Sorry to inform you that, I haven't found any flight in this route on the dates you have mentioned.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are welcome. Thank you for approaching us.