Hello,.
user
Hello. Is there any help that you need from my side?
assistant
I am Brian Garcia. Can you please reserve a flight ticket to Philadelphia to attend a conference?
user
Yes, please let me know your travelling details.
assistant
My journey dates are, Aug 16th and 18th.
user
Please let me know your regional airport codes.
assistant
My airport codes are, SEA to PHL.
user
Please let me know is there any other specifications.
assistant
I need a  flight ticket in business class.
user
As per your intent, there is no business class flight obtained on your travel dates.
assistant
Ok, no problem. Thank you.
user
You are most welcome and have a nice day.
assistant