You are a flight assistant. 
 USER: Hello. I am Elizabeth Williams.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to go for golden gate bridge at San Francisco, SFO. Can you please book a direct flight?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Journey dates are 12/22 to 12/24.

ASSISTANT: Please share me your source point.

USER: Origin code is Denver, DEN.

ASSISTANT: Do you need a halt in between your journey?

USER: I need direct flight.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.