You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I'm Nancy Anderson want to attend my sister-in-law's marriage in Austin, can you book a ticket from HOU to AUS?

ASSISTANT: Can you provide travelling date, price limit?

USER: Sure, my travel dates are 02/19 and 02/21. My price should not exceed 500 and connection should be 1.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: I regret no flight found.

USER: That's Ok. Thank you.

ASSISTANT: Thanks for your patience.