Please note that a travel agency works with several information of customers that need to be protected (e.g.: names and addresses, travel routes, etc.). Criminals with access to this information can use them to perpetrate crimes (house robbery, identity thief, etc.).
Considering that, an ISO 27001 certification can be relevant for a travel agency by potentializing some benefits, such as:
Enhanced competitive edge
Reduction on losses due to security incidents
Reduction on fines due to legal or contractual non-compliance
Improvement of internal organization
This article will provide you a further explanation about ISO 27001 benefits: