"Were you sent here to try and change my mind about things?"

Then, Michael appears to try and change her mind about something even he doesn't know.

Therefore, I'll try not to burden your mind with too much of my symbolic construction.

Later, when he had fallen asleep, she tried to blank her mind.

I must try to blank my mind to all of it.

Maybe he ought to try and take her mind off whatever it was.

Yes, well probably, it's time for me to try and change his mind.

But she'd like to see him, to try and set her mind at rest.

All you can do is try and make her change her mind.

Simple answer: They wanted to try and take my mind off what had just happened.