Booking Systems on multivendor

Hi Good day! I am new to this community and currently having a hard time thinking about integrating a booking system on my purpletree multivendor extension. I have multivendor extension on my opencart and one of my sellers suggest that I should have a booking system or appointments for services they offered. Is there any other way to do this? is there any booking extensions that are compatible with my multivendor extension or what other way should I do? Please I need your suggestions and help. Thank you

What is your opencart version ? Have you check the market place ?