1. Confirm the identity of the reimbursement person: signature is a way of identity authentication, which is used to confirm the identity of the reimbursement person. In the process of air ticket reimbursement, it is necessary to confirm whether the person applying for reimbursement is a legitimate passenger or an agent. By signing, the reimbursement person can prove that he is the actual holder or agent of the ticket, thus ensuring the ownership and legality of the reimbursement expenses.

2. Guarantee the authenticity: Signature can also guarantee the authenticity of the reimbursement ticket. In the process of air ticket reimbursement, there may be false or forged air tickets. By requiring the signature of the reimbursement person, the authenticity and legality of the ticket can be ensured, and the reimbursement of false or forged tickets can be prevented.