You have to show up personally as far as I know. It's the only thing that has worked for me
Your best bet is to go on line
I agree with what Mr. William Thomas said. When I went to the Greyhound in January, I first looked online for tickets to Long Beach CA, finding one that fit my budget, I called the toll-free number and made my reservation, electing to pick up my ticket at the station itself.
Go online to buy a ticket or go to any 7-11 they are an authorized GH ticket vendor. Or go down to the terminal. 200 Soth Main by the Plaza hotel.
Thanks! Your answer is awaiting moderation.