You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I'm planning to visit Denver botanical gardens, can you please book the ticket from JFK to DEN?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Sure, I would like to depart from my source location on 23rd of Dec and I want to return back by 25th of Dec.

ASSISTANT: Ok, could I have your name please?

USER: My name is Raymond Thompson.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I don't have any connection limit.

ASSISTANT: Ok, do you have any other specifications?

USER: I want to return in the evening time.

ASSISTANT: Sorry, there is no flight on your requested time.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: You are welcome, have a great day.