Hi. Patrick Jones here.
user
Hello, how may I assist you?
assistant
Find a flight for me that is from OAK to CLT.
user
Ok, please tell me your travelling dates.
assistant
My preferable dates for travelling will be 09/27 to 09/29.
user
Ok, please allow me a minute.
assistant
Sure.
user
Jones, there is no flight  on your requested dates.
assistant
Ok, not a problem. Thank you.
user
Thank you for reaching us.
assistant