travel outside station

One teacher had asked me if he is allowed to travel outside official station to attend seminar in Manila. One of the requirements for travel is, she must have the authority to travel approved by his head of office. The travel for seminar whether personal or official must be approved by head of office. When it is official and he claims for traveling allowance, this must follow the certain provisions of travel law. For more details, please check me at 09204735133, thank you.