You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to reach San Francisco, to attend an cultural event. Can you book me a flight ticket?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Could you please help me with boarding and landing points?

USER: Boarding is from DCA and landing at SFO.

ASSISTANT: Do you prefer a direct flight?

USER: Yes, I prefer a direct flight.

ASSISTANT: Kindly, mention your journey dates.

USER: I want to start my journey on June 22nd and return will be on June 24th.

ASSISTANT: May I know your good name?

USER: Jeffrey Lopez is my name.

ASSISTANT: Please, wait.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting, there is no flight found in search.

USER: That's ok, not an issue. Thanks for your kind information.

ASSISTANT: Thank you for choosing us.