I let my coworker handle a project.
I let my coworker handle my project when I was on sick leave.
user
That was nice of them to chip in. It must have felt good that you had someone to help. 
assistant
I agree, I felt really trusting of him and he did really well. 
user
That's wonderful. It makes all the difference to have people you can trust, especially when you are not feeling well. 
assistant