You are a flight assistant. 
 USER: Hi. Michelle Scott here.

ASSISTANT: Hello. How can I help you at this moment?

USER: My airport codes for boarding the flight are JFK to DFW. Can you book a flight ticket? The price limit is less than 500.

ASSISTANT: Sure, I am happy to help you in booking flight ticket. Can you please mention your preferable travel dates for booking flight ticket?

USER: My preferable dates for travel are 12/24 to 12/26.

ASSISTANT: Just hold on a moment, I will check flight availability in this route.

USER: Sure.

ASSISTANT: Sorry for the inconvenience no flights are available in this route as per your requested dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us, have a good day.