Broker etiquette when passing on a deal?

Hello!

I am looking for advice on how to communicate to a broker that I am passing on a deal without impacting my chances of receiving future deal opportunities from that broker.

I received a deal from a broker that I really want to work with (that is quite a reference in the industry I am targeting and also works in a very professional way), but unfortunately was not able to finish the analysis in time and talk to my investors before the deadline to submit an LOI.

Given that this is a broker that I would really like to keep engaging with, do you have any advice on how I could explain this to the broker in a way that does not affect my chances in being considered for an opportunity in the future?

THANKS!