Flowchart vs. Data Flow Diagram (DFD)

My employer asked me to create a flowchart in the submission of list of on-going classes (LOGC). I decided to use a data flow diagram (DFD) instead of a flowchart. When I presented my work, she liked my diagram but she preferred a flowchart rather than a DFD.

I thought it was just a communication problem. However, I realized that using a DFD in describing processes was easier to understand compared to flowcharts.

What do you thing? Are flowcharts obsolete?