You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I render you?

USER: I am Anthony Scott. As my plan to give a seminar in University of Houston at Houston, TX-HOU , can you please help me to book a flight ticket from Las Vegas, NV-LAS?

ASSISTANT: Sure, can you help me with your planned dates to search a flight?

USER: I will depart on 09/27 and I intend to return on 09/29.

ASSISTANT: May I know your price limit?

USER: I need the ticket with in the fare limit 1000.

ASSISTANT: Thank you for your details, sorry there is no flight is available for you.

USER: Ok, no problem. I'll choose another alternative.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Thanks for your information.