There is no telephone appointment booking service. To make an appointment for a U.S. Citizen service in Bogota visit: https://cacms.state.gov/s/new-appointment or if you prefer to apply at the U.S. Consular Agency in Barranquilla visit: https://co.usembassy.gov/u-s-consular-agency-barranquilla/ . There is no walk-in service for U.S. citizens who require a service related to passports, citizenship, reports of birth abroad or notarial services. These services are by appointment only.