You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you?

USER: I am Mark Lewis. Please book a ticket from Austin, TX-AUS to Las Vegas, NV-LAS, for sports festival.

ASSISTANT: Sure, I am blissful to help you. Please share me your travelling dates?

USER: My travel dates are from 10/13 to 10/15.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight. Price limit is 500.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for being with patience. Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Thanks.

ASSISTANT: Thank you for your presence. We hope to serve you again.