Nine96, for what you're asking the simplest solution is to use several expression boxes side-by-side and give some of them bold formatting. For your first example, use one expression box to show "My name is ", another box to show the value of the field in bold, one to show " (", one to show the value of the next field, and one last one to show ")".
An ordinary text box can only show one formatting style at a time. A rich text box can be more complex, but it is tricky to modify and requires code.
Bhavesh, to accomplish what you are trying to do, you can use ____isChanged flags to apply conditional formatting to fields, then set all the flags to false right before the form is submitted. This would require writing a bit of code in the fields' onChanged events.