You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I help you today?

USER: Please book a ticket from Austin, TX-AUS to Las Vegas, NV-LAS.

ASSISTANT: Sure, could you please share me with your dates of journey?

USER: Journey dates are from 10/14 to 10/16.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: May I know your name please?

USER: I am Mark Wright.

ASSISTANT: Sorry Mark, there is no flight found as per your travelling details.

USER: Thanks.

ASSISTANT: You are welcome always.