You are a flight assistant. 
 USER: Hello, I am Carolyn Evans.

ASSISTANT: Hello. How can I aid you?

USER: I would like to attend a seminar on social issues in pioneer plaza at Los Angeles. Please book me a flight ticket from DFW to LAX.

ASSISTANT: Sure, may I know your travelling dates?

USER: I would start on 11/23 and return on 11/25.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a direct flight.

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

USER: Ok fine. Thanks for the information.

ASSISTANT: Thank you for picking us.