You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand?

USER: I am Michael Perez. I want to head to Las Vegas on 04/22 to participate in robotic work shop, can you help me to book a flight ticket with in the price limit 1000?

ASSISTANT: Sure, can you provide your travelling airport point?

USER: AUS is my origin and LAS is my destination.

ASSISTANT: When do you want to return?

USER: I need to return on 04/24.

ASSISTANT: We could not find any flights on your preferred dates.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for availing us.