A good thing to remember is that people always like to talk about themselves. Myanmar people are always curious about what foreigners think about their culture, food, and general experience. They may even want to discuss some political things but it’s important to not share too much of your opinion as you may not know where they lie on the spectrum of support of the current government or their ethnic affiliation. You may know that recently there have been some anti-muslim sentiments in the form of moving the Rohingya people out as well as civil war between ethnic groups.
I like to stick to talking about where they are from, what ethnic group they are (this is not offensive in Myanmar), the weather being super-hot or wet, food I like to eat in Myanmar and how spicy I like it, and also general things I like about Myanmar people like they are friendly and helpful. If you stick to the basics of these then you are fine.
Myanmar business culture isn’t too much focused on small talk but it can be rude to jump directly into the business conversation. You usually would have a chance to catch your breath, get comfortable, and get a tea or coffee. During that period it’s normal to have these types of small talk conversations. And when it becomes awkward, just smile and thank them for their hospitality.