That is generic, though. This is your problem. It doesn’t matter that the buyer is asking for a designer and you do design. You still have to tailor your case to their specific needs. The need of a designer is just the general need. What kind of branding do they need? What is their industry? What kinds of products need design? Etc. Simply saying you are a designer is generic and doesn’t give any insight on your suitability. You must tailor to the buyer. Always.
Any good buyer is going to specify those details to get the best fit for their project.