Static text is - as the name says - static text. Column references of type {column_name} do not work.
If you want the entire text on one line, here’s what I would do: Add an extra formula column and use this formula "Dear "&{Name}&" thank you for your order."
Add this field to your Page Design template.
You can also do this: Add a static text element with “Dear”, add the field element for the {Name} column, add another static text element with “thank you for your order”.