We bought our JR pass and made reservation from/to Tokyo - Shin-Hakodate online with JR East because we will travel during Golden Week.
From Tokyo to Shin-Hakodate, the train will stop at Shin-Aomori. So if we decide get off at Shin-Aomori to visit Hirosaki. Do we have to cancel our leg from Skin-Aomori to Shin-Hakodate before we board the train? It is a courtesy to cancel but our train is at 6:32 am, is the JR ticket office open?
Also, from Shin-Hakodate to Tokyo. Instead of boarding the train at Shin-Hakodate, can we board from Shin-Aomori instead wi.thout changing the reservation