Hello Saif, I will advise you to look at this course. How to debug. 

For this type of case, it's a great tool to find what is happening, and why you are not receiving any values, or if nothing is being created or updated.

From what I can see, this variable is not being used anywhere, and you are not doing anything with that variable. I think the error is there.

Instead of using this variable

Use the variable that you are using in the dropdown

Copy that variable and past it here

EDIT:

Or you can simply, put on the dropdown, the variable 

CurrentAssignedTo

Let me know if it works

Regards,

Márcio