Book a call with sales rep

Question

I have to code a functionality where I have to provide the potential customer visiting the web page with an option to book a call with sales representative. The sales rep has MS 365 account while the customer doesn't have MS account. The customer could select the sales rep whichever is free for the desired time slot. He then can schedule a meeting or he could send an invite to schedule a meeting with him to sale rep. After this the calendar of both parties should be booked and a meeting link should be generated to join meeting and respective mail should also be sent at both ends.

Given that I have one MS account in sales team tenant what are the steps I can follow to achieve such functionality? The customer does not have MS account so there cannot be an access token from his side, then how can he be able to book meeting?