If the request is serious, it is better to meet the person personally. Then the chances of success are greatly increased. Attempts to take money or to provide any service by e-mail or short messages often end in failure.
In the experiment, was attended by 45 students. They asked their friends to provide a service to one of ways: in person or by email. On the received data, says the publication The Daily Mail.
The results speak for themselves. 70% of the requests in person face-to-face was a success. Email agreed the service only in two percent of cases. Apparently, personal contact the person really difficult to refuse.