Information about Hugo Kessler, JV44

Dear forum members,
I am trying to gather information about my father Hugo Kessler, who somehow flew with Adolf Galland in the last days of WWII.
He is been mentioned in one of the books about the ME 262 and JV44 (The Me 262 Stormbird: From the Pilots Who Flew, Fought, and Survived It
Heaton, Colin D.) telling that he flew together with Lutzow in a Fieseler Storch towards Gem Eisenhower in order to negotiate the special surrender of JV44. But they got shot down and the message never got through.
We had a lot of ME262 stuff at home when I was a kid and I kind of remembered that Adolf Galland at least once has visited our house but I was pretty young and war - stories were not particularly popular in the 50s and 60s in Germany.
Any help where to find information is really appreciated