You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I need to have a flight ticket between DEN and JFK, can you please help me out with that?

ASSISTANT: Sure, May I know the travelling dates?

USER: Thank you, my departure is on Jan 09 and please book my return ticket on Jan 11.

ASSISTANT: Do you have any connection limit?

USER: I will prefer single connection.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: Sure, my name is Brandon Young.

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

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Anyway, thank you for checking.

ASSISTANT: Thank you for opting us.