I can see dinosaur bones in the museum. √​​

-나는 요가를 배울 거야. 그래서 몸무게를 줄일 거야.

I will learn yoga. So I am going to lose weight.

=> I will learn yoga. So, I am going to lose weight.​

OR

=> I'm going to learn yoga. Then I'm going to lose my weight.​

I don't have any plan.

=>​I don't have any plans.​

-여보세요. 저는 돌돌 인데요심순이 있나요?

Hello. This is Doldol. May I speak to Simsoon?​ 

=>​ Hello, this is Doldol. May I speak to Simsoon?​​

OR​
​=> Hello, this is Doldol. Is Simsoon there?

• Corrected : The sentences are corrected grammatically.​​