There is no exact formula but just some quick thoughts you might find useful.

I would consider sharing a list of a questions with the expert ahead of the meeting (like an agenda) so they know and can think ahead of time of what their responses might be. Also, point out things like wanting to be "a good steward of your time" so they realize you are being conscious of their time commitment to the meeting. Lastly, always leave yourself time at the end for scheduling a next step/follow-up with a specific ask (e.g. could we touch base again via a cal in 2 weeks etc.)

Start with where you hope this expert's advice will get you. Be as specific as possible about as many details as possible. Then walk backward during your conversation to where you are now. I'm sure the expert knows a lot of things, about a lot of things. Your challenge in structuring the conversation is to laser focus on those things that will have a practical impact on your organization.

Avoid yes/no questions. Ask questions about How and Why.
One way to do this is to prepare your questions before hand, then review them considering why you are asking each question: this may help you get to more salient questions underneath.

Always prep. Take time with a list of questions for both you and the "expert."Each question should lead you to the direction you need. Understand it may take 3-5 min to fully answer the question, longer for more technical ones. Let them answer the questions while you take notes. Be sure not to interrupt the answering portion; save your questions for the end to avoid rabbit trails.

Hello I am Priyanka.

I would like to share my experience with you.

All workers and workdays are unique. With fewer companies and employees adhering to a traditional 9-to-5 day, the differences in our workdays are becoming more pronounced. But putting those differences aside, three overarching ideas apply to all our productivity tips:

1. Trust the small increments. You can’t expect to change years of working habits overnight. Small changes in how you work can gradually add up to big changes in productivity. Try one tip to start, and keep adding more as you find the strategies that work best for you.

2. Be accountable. Whether it’s weekly check-ins with a co-worker or setting your own deadlines and announcing them to others, having to answer to someone else can often force you to get the job done.

3. Forgive yourself. You are human: Accept that you are sometimes going to slip up, become distracted and have a bad day. It’s more important to move on than to dwell on your mistakes.

Source:https://www.nytimes.com/guides/business/how-to-improve-your-productivity-at-work

For further queries you can consult me.