The driver sends an assistant request, determines his location, chooses the required service, and sends what he needs from the assistant in a public chat. A person close to him volunteers to help him or wants to help him accept the help request and be helped, the driver can track the person who accepted the request The driver can communicate with the volunteer in a private chat He can send pictures and communicate with him in writing and voice.

Based on the information above, draw use case digram,class digram,activites digram,sequence digram.