You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Could you please help me in flight ticket booking process from DEN to SFO?

ASSISTANT: Sure, May I know the travelling dates?

USER: Thank you for your response, I want to take off on Jan 13 and book my return ticket also on Jan 15.

ASSISTANT: Do you have any connection limit?

USER: I will prefer 1 break in between my journey.

ASSISTANT: Is there any other requirements?

USER: I want to take off in afternoon time.

ASSISTANT: May I know your name?

USER: Sure, my name is Helen Jones.

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

USER: Oh! It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.