Traveling on Hayabusa 30th Dec

Hello everyone!

I just want to ask. We arrive in Narita at 10 am. We want to go in Sapporo, with Hayabusa shinkansen till Hakodate, but... Is there chance, that we can't book tickets on it?
Because i read about it. On this dates will be very much travelling people, but all information was about Osaka destination, not about Hakodate.

What chances do we have? No problem and first train will be free? Waiting around 3 hours? At this date no tickets?

Sorry for my English!

There is a very real chance that all reserved seats will be booked on the 30th, but it's impossible to be certain. There are non-reserved seats up to Morioka.

Baddest.
https://goo.gl/jF7bQ1
shiteiseki : reserved seat
manseki : full booked
shujitsu : whole day = all time

Should change flight to CTS.
http://www.new-chitose-airport.jp/en/
via domestic
http://www.new-chitose-airport.jp/en/airport/airline/dmstc.html
via int'l
http://www.new-chitose-airport.jp/en/airport/airline/inter.html

Thank you for your answers. Sadly, but airplane is too expensive for this dates.

I have one more question. Is it true, that many people will go till Sendai, and from Sendai is more chance to seat on Hayabusa?