Travel invoice is referred to the request of payment made to a customer after receiving guidance on travel by a professional agent. The invoice may be generated for a number of services like ticketing, hotel bookings or phone, etc. These agents help you plan your tour by providing guidance to you for all things related to your travel. They help you in getting yourself a hotel which would best suit your budget, a location where you would be at ease. They help you by doing your travel research on the place where you are willing to go.