An appropriate way to invite someone to an informational interview is by sending them a message via the Internet. You can use "Informational interview request" as the message title, so they immediately know what your message is about. An effective informational interview request typically includes mentioning how you discovered the letter recipient, why you think they can help you understand a specific job or industry and the amount of time you ask from them. You can also include a suggestion regarding the time and date of the interview. When drafting your message, it usually helps to use a professional tone and ensure it's free of spelling or grammatical errors. If they don't respond within two weeks, consider sending them a polite follow-up to ask them if they perhaps didn't see your message. If you still don't get a reply, you may take it as a sign that the respective person either doesn't receive your messages or isn't interested in the invitation.