You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I am Ashley Edwards want to visit Houston to attend a workshop, can you book a ticket with price under 500?

ASSISTANT: I will help you with that, can you please share your journey dates?

USER: Sure, my travelling dates will be 12/30 and 01/01.

ASSISTANT: May I know your airport codes to proceed further?

USER: Sure, I want to fly from LAS to IAH.

ASSISTANT: I am sorry to say that there is no flight found under your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us, have a great day.