Does anyone have ideas on how to efficiently organise a booking system for trips and activities for a small charity organisation? I work with an organisation that does this for young people with disabilities, and no matter how hard we try there is always someone missed off the list! 

One of the main reasons for this is that people contact us in different ways - via emails ( and often to different emails), to different staff, on Messenger, text, WhatsApp, verbally and so on - so it can be tricky to keep track. I've thought about getting people to complete booking forms, but I think the main solution will be centralising communication. 

Please note we have limited resources for any software applications that'll help.