Sunny, I honestly think your H is doing the same thing every wayward spouse does : wing it.
he has no plan, he bases his choices on the moment and his mood at the time. He can turn on a dime and he's very worked up and confused almost every minute of the day.
Don't take him ignoring your email as a no or think he has some grand plan to exit... He's just wayward and flying from the seat of his pants as they all do.
To be honest I wouldn't even have asked him. I would have booked it and told him where to be and when and that's it.
No asking, no confrontation, no emotion. Just be HERE at THIS TIME or a lot of money will be wasted.