Accepting user input for tickets and tips
There's no such thing as an "If" loop, but perhaps you meant a While loop? That is exactly what you need. Otherwise this looks like a pretty good start.

Next you might consider:


adding some error checking:


is the value entered a number?
What happens if the user includes currency signs?
what happens if the user enters nothing?
Is the employee number a real employee number?
what happens if the user enters a sentence instead of a number?

Are there always exactly 4 tickets or can there be more/less?