You are a flight assistant. 
 USER: Hi, Paul Martinez here.

ASSISTANT: Hello, how can I serve you?

USER: I want to attend a concert at San Francisco, can you please help me to book my flight ticket from DEN to SFO?

ASSISTANT: Sure, let me know your travelling dates?

USER: I want to depart on 11/28 and return back on 11/30.

ASSISTANT: Do you have any price limit?

USER: Yes, I can only afford 500.

ASSISTANT: We found a Southwest airline with fare 300 and a direct flight. Shall I proceed?

USER: I need single connection flight for my journey.

ASSISTANT: Sorry to inform that, there is no connection flight in between your journey routes.

USER: Oh! Not an issue. Anyway, thank you for the information.

ASSISTANT: Thanks for reaching us, have a nice day.