You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Laura Moore here, I want to book my flight ticket. Please can you check if any flight is there on 11/24 from LAS? From LAS to BOS.

ASSISTANT: Sure,please provide your return date.

USER: I want to come back on 11/26.

ASSISTANT: OK,wait a moment.

USER: OK.

ASSISTANT: Sorry, as per your requested dates there is no flight ticket available.

USER: It's OK. Thank you.