I've never booked on united, so I'm a bit unfamiliar with their stopover and open jaw rules, but it is my understanding that you get 1 stopover and up to 2 open jaws. Could this be done:

nov 1st SFO-MNL (stopover and open jaw???)

nov 10th NRT-KTM (destination)

nov 30th KTM- SFO

I called and tried to book, but the agent said I couldn't. I'm not sure if this is valid and I should keep trying to call back, or if this is invalid. If it's invalid, could you let me know why? The agent didn't seem to know.

Thanks