When checking in a client first check if the client has a booking for that day, otherwise the client will receive an sms informing them that they missed the booking.
If a patient made an incorrect booking see if you can edit the booking using the edit visit screen, if not you can cancel the booking from the appointments -> Single screen if no tests have been done and check the client in as a walk in.
If a client has missed the booking and comes the following day you can still check the patient in using the previous booking. I have included a guide below.
1. Search for the client and select him:
2. Go to visit detail and select the booking you want to use to check the patient in with.