Need helpin creating a drop down menu which pulls all pages

Ok I have a order page where a user selects from a drop down menu certain choices, selects one and then clicks order.

What I want is for this list now to be changed to it calls the names of the titles of the pages in my wordpress site and uses that for the order information. Question is I have no idea how to go about doing this.

Does anyone have any clue how I would doe this?

Thanks