As you can use an action to, dash, dodge, attack, cast spell, etc.
Am I allowed to walk my normal movement >> use my action to dash >> then use 2 SP to quicken a spell/cantrip?
My DM reasons like this:
Because I chose to Dash with my action, I do not have any action available to convert into a bonus action and I cannot do what I described above. The official ruling says: "When you cast a spell that has a casting time of 1 action, you can spend 2 sorcery points to change the casting time to 1 bonus action"
I would plead that making that spell a bonus action would not require me to have an action available. And is counted as a free action.