NOTE: I noticed in the body of your email you have Please enter your Last Name twice. Was one of these supposed to be for First Name?
The flow below should work if your Country field in MS Forms is of type Choice or Text.
The flow adds a variable to hold the final output of Country. It then uses a condition to check if the user entered/selected a Country or not. If they did then it sets the Country variable to the actual Country, otherwise it sets it to /
You can then use the Country variable within your email.
See flow below:
