Display screen having a transitional graphical user interface

FIG. 1 is front view of a first image of a display screen having a transitional graphical user interface, showing the new design;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof;

FIG. 4 is a fourth image thereof;

FIG. 5 is a fifth image thereof;

FIG. 6 is a sixth image thereof;

FIG. 7 is a seventh image thereof;

FIG. 8 is an eighth image thereof;

FIG. 9 is a ninth image thereof;

FIG. 10 is a tenth image thereof; and,

FIG. 11 is an eleventh image thereof.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1 - 11 . The process or period in which one image transitions to another image forms no part of the claimed design.

The broken lines showing the display screen form no part of the claimed design.