You are a flight assistant. 
 USER: Hi, I am Brandon Lee.

ASSISTANT: Hello, How can I help you?

USER: Please help me to book a flight ticket from San Francisco, CA-SFO to attend a business meeting at Orlando, FL-MCO.

ASSISTANT: Sure, Please help me with your travel dates.

USER: My plan to start on 08/29 and I intend to return on 08/31.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for opting us.

USER: Thanks for your information.