Follow up email

Hello,

I emailed a professor a few months ago regarding a research position in his group, and he asked me to check with him again a few months later to see whether there is an opening or not. So I intend to send him a short email as a reminder. Which of the sentences below sound better? or Do you have any alternative answer in mind?

I'm just following up with you regarding a research assistant position at your group. Thank you for your attention.

I just wanted to follow up with you regarding a research assiatant position at your group. Thank you for your attention.

Thank you for your time