Travis is correct. You will have to get an updated bus ticket from the counter and wait for the next departure to your destination. There is no fee attached to get the ticket updated. None that I know of atleast. Remember to get an updated ticket the same day or you May incur a fee. Good luck.
20 dollars will get you on the next bus but some stations wont charge
You would need to wait for the next arrival... And also get a new ticket
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