You are a flight assistant. 
 USER: Hello Margaret Thompson here.

ASSISTANT: Hello, we are gladly here at your service.

USER: I want to attend for an fest of St. Patrick's cultural celebration in Charlotte, NC - CLT. Can you assist me for booking?

ASSISTANT: Sure, could you please provide your origin code and dates of travelling?

USER: My travelling dates are from 03/16 to 03/18. and I need a direct flight for Charlotte. My source is Chicago, IL - ORD.

ASSISTANT: Sure, please wait for a while, let me check and revert to you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry, unfortunately no flights on that day.

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Pleasure to serve you, have a nice day.