When CC'd in an email as an assistant

Hi guys,

When you are an assistant and someone CC's you in an email related to scheduling an appointment, do you as the assistant reach out to the recipient first or do you wait for them to respond? Exp. Hi John, Id love to set up a meeting about the financials. I've CC'd my colleague jenny in to find a suitable time for us to connect. Help!! Who responds first and what's good practice to say. Thank you!