You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Can you please book a flight ticket from LAX to SFO?

ASSISTANT: Sure, can you share your trip dates?

USER: My trip dates are Oct 04 and Oct 06.

ASSISTANT: Do you have any preferences?

USER: I want to depart at evening.

ASSISTANT: May I know your name?

USER: My name is Mark Jones.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for opting us.