What does the teller need from him to complete the form?

The teller needs a signature to complete the form because a signature serves as a formal validation of the information provided. It is an important element that signifies agreement or approval. When filling out forms, especially those related to banking or financial transactions, a signature is often required for authenticity and to ensure that the person completing the form is indeed the one who authorized the transaction. This process helps prevent fraud and assures that the transaction is legally binding. Other information such as name, address, or date may be necessary for identification or record-keeping purposes, but the signature is typically the critical component that finalizes the document.