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