Join two files

i have two files and i want to join the contents like:
file a has content
my name is
i am
i work at

and file b has

John sims
43 years old
maximu ltd

and i want to join the two files to get a third file with content reading

my name is John sims
i am 43 years old
i work at maximu ltd

paste -d ' ' a b

Thanks it worked