I have returned part time from a 3 month layoff period to my employer of 6 years. While on layoff, I made plans for a trip in May. During the recall correspondence, I was open about my upcoming availability the month I plan to be away. My employers said they do not approve my request. While I was on layoff, they updated their vacation request policy, however I more than meet the required request notice window, as well as schedule availability notice which is required to be communicated two weeks in advance and 4 weeks in peak season which they have stated starts in June. I restated that my plans are concrete, but I am available to respond to my recall and am available to work. The situation is at an impasse, as they have denied my request but my plans have not changed, and I’m concerned when May comes around, they will try to fire me for not being available even though they recalled me with my availability disclosed. Could they fire me and argue with just cause?