No. Travel agents have to meet very few formal requirements. Most travel agents do belong to one or more professional associations, however, and each association has a code of ethics that requires its members to remain knowledgeable of developments within the travel industry and to refrain from engaging in misleading sales practices. Membership in a professional association is voluntary, however, and, if an agent violates the code of ethics, you have little recourse within the association.
If you have a complaint about a travel agent, ask someone in the travel agency if the agent belongs to a professional association and, if so, which one. Then contact the association and ask if the agent is a member in good standing. In some cases, an association may be able to help you if you have a complaint against one of their members. For example, the American Society of Travel Agents (www.asta.org) has a mediation program to help resolve disputes between travel agents and their clients.