What's up when you try and make a reservation online it says"our service is being stubborn try again".
They are probably being hacked!
It happens often... reload, or clear cookies, or try another browser
No reason to believe that it's a hack.At most, it might be a DDoS attack (which isn't really hacking, more juvenile vandalism).
Probably, IT department might be doing minor updates and testing live. Or, there is an unforeseen popular demand to access the reservations system and it slows down one of their servers so much that it times out.
Retrieving data ...