Ask the user to enter their first name. Dont forget to first declare a variable for the first name.Ask the user to enter their last name. Dont forget to first declare a variable for the last name.Ask the user to enter their age. Dont forget to first declare a variable for the age.If the user is younger than $21$ yrs old, display a message indicating that they cannot make a hotel reservation and ask the user again to enter a valid age. HINT: This is Input Validation that uses a WHILE loop. The program wont continue past this point if the user keeps entering an age younger than $21.$Ask the user what kind of bed is preferred $($king size, queen size, twin$).$ You must use an if$-$else$-$if construct to display a friendly message about the selected bed type. $($Hint: Use a char variable$)$Ask the user how many nights the reservation will includeAsk the user what room type is preferred $($beach view, city view, balcony, garden view. In this hotel, all room reservations typically cost $$100/$night$.$ However, Beach View rooms cost $$25$ more. You can use any IF construct here $($IF$,$ IF$-$ELSE, IF$-$ELSE$-$IF$,$ nested IFs$).$Additionally, rooms with king size beds cost $$10$ more. This cost is added to the room cost regardless of room type.Display a message indicating the cost of the reservation. A $5\%$ city tax is also added to the cost. In C$++$