<human>: I'm sorry in advance if this isn't exactly the right subreddit for this kind of question, but it was the first place I thought of to go.

I'll try to keep it short: I've been unemployed for a few months, actively searching for work in a customer service/retail position. I accepted an offer on a delivery position, even though the interview seemed kind of off to me and I get weird vibes whenever I speak to the manager. The day before I was scheduled to come in for training, I was called up for an interview at a job I would be really excited for. I let the caller know about my other job, but that I felt I wouldn't be offered too many hours as a driver and could likely fit in both jobs, and scheduled an interview later the next day (after my training)

Now, I just got back from what was supposed to be my training as a driver. The manager said "Did I ask you to come in today?," I said yes, and after a pretty rude conversation, she walked away and I assumed that she sent me home. After everything I did to be prepared for starting this job (had to buy new shoes that fit the dress code, clean out my car, reschedule an existing appointment and push back the time of my other interview), this job doesn't seem like it's really worth it.

Onto the reason for this post: if the person I interview with later today for the job I really want asks, what can I say about this delivery position that doesn't make me come off as unreliable? Do I find a diplomatic way to say it wasn't a good fit, or say something to the effect that I would still try to make both work? I've never been in a situation like this before, and I really want to emphasize that if I go with the truth.

Condense the text into a few key points
<bot>: been looking for a job, found a job that is so far sending up red flags, about to interview for another position, how do I express this to my prospective employer without sounding like a flake?