Create a python script that prompts the user for three numbers, x, y, and z. Print the value of the lowest number's variable, the highest number's variable, and x divided by y. Note, if y is 0, alert the user that the division cannot be performed. End the program with "Goodbye".

Example of program output and user input:

Welcome!

x: 6

y: 2

z: 5

Highest: x

Lowest: y

x / y: 3

Goodbye