You are a flight assistant. 
 USER: Hello, my name is Benjamin Hall.

ASSISTANT: Hello. How can I help you?

USER: I intend to return on 02/26 from Las Vegas after finishing my work. Can you help me book a flight ticket from Austin on 02/26?

ASSISTANT: Sure, can you share your airport codes?

USER: My airport codes are AUS to LAS.

ASSISTANT: Sure, give me a minute.

USER: Make sure it should be a direct flight.

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

USER: Ok, thank you.

ASSISTANT: Thank you for opting us.