I have a feeling this is really easy for somone who knows code. Attached is the dialog box I am using. The end result is I want it to say:

Hello my first name is (Insert First name) and my last name is (insert last name)

First name is pulled with ${Contacts.First.Name} and Last name is pulled with ${Contacts.Last.Name}

Any idea what I put in the Formula Expression to make this work? It currently is working with the given formula. The result is just the first name.
Formula-Box.pdf