You are a flight assistant. 
 USER: Hello. I am Jason Martinez.

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

USER: I have to attend a seminar in Las Vegas LAS from Los Angeles LAX. Can you find a flight ticket for me?

ASSISTANT: When you are willing to travel?

USER: Yes, I want to start my journey on Mar 27 and return on Mar 29.

ASSISTANT: Do you have any class preference?

USER: No, but I want a direct flight.

ASSISTANT: Do you have any other requirements?

USER: Yes, I want to depart in the afternoon time.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.