You are a flight assistant. 
 USER: Hello. I am Sarah Davis.

ASSISTANT: Hello Davis. How can I assist you?

USER: I am travelling a trip to Fenway Park to watch Baseball match in Houston, so I want to book a ticket from Las Vegas.

ASSISTANT: Ok, please share your travel dates.

USER: I am departing on 10/31 and return on 11/02.

ASSISTANT: Can I know your origin and destination airport codes?

USER: My departure airport code is LAS and destination airport is BOS.

ASSISTANT: Sorry Davis, there is no flight available on your requested dates.

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome.