Amgen Sr. Associate interview questions

Completed the first round HR interview and was invited to choose a date and time through the AI assistant to interview with the Hiring Manager. 30 minutes before the scheduled interview time, I was notified that the hiring manager was no longer available and was provided another list of available dates and times. The day the rescheduled interview was supposed to take place, I was again notified that there was a scheduling conflict. Rescheduled once again, same thing happened again, and I didn't bother to continue. Extremely unprofessional

Quick, questions as to be expected at each stage. No panel interview or presentation. Questions following the usual 'tell me about a time when...' structure. Recruiter was prompt at sharing updates.