You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you for the day?

USER: Can you please help me with booking a flight ticket from DEN to SFO?

ASSISTANT: Can you please share your travelling dates?

USER: My travelling dates are from Jun 26-28.

ASSISTANT: Do you prefer class?

USER: I prefer economy class.

ASSISTANT: Do you need connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any other specifications?

USER: I want to start in afternoon.

ASSISTANT: May I know your name?

USER: Sure, Angela Jackson here.

ASSISTANT: Sorry, no flight found in that route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.