The story format is just a guidelines. The persona's help the team to step into their shoes a bit.
I think you can combine both into a single story:
As CHANTAL the cafe owner, when I am at the wholesale business, I want JIM the SALESPERSON to register me
into the ordering system, so that I can order stuff online when I am not in the
wholesale-shop, because this saves me a lot of travel time.
- Make it real persons, clients says nothing. It is hard to relate to. Preferable real clients or users that you sometimes speak to.
- Add the change in behaviour, ordering online is not the reason this client wants to be registered. Have a look at impact mapping to improve the value of your stories.
Don't be limited by a single Actor/Persona and feel free to add less or more information. Certainly don't try to push data into the format when for example a short description and some bullet points would also suffice. I have seen Product Owners write user stories just to change the text of a label. Use common sense.
Jeff Patton will shift your paradigms when it comes to the use of user stories. I think it is worth to invest some time in.