You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brandon Clark.

ASSISTANT: How can I assist you today?

USER: I am planning to visit Microsoft theater in Los Angeles, LAX. Can you help me to book a flight from Las Vegas, LAS?

ASSISTANT: Sure, can you please share your travel dates?

USER: My travel dates are May 20 and 22.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specification that you are looking for?

USER: I want to depart in the afternoon time.

ASSISTANT: Brandon Clark, I am sorry to inform you that there is no flight available at your request.

USER: Ok, thank you.

ASSISTANT: You are welcome. Thank you for contacting us.