This question already has an answer here:
Imagine I sent an email with a question to a person working in the UK in an organisation with relaxed work standards. Technically it is his responsibility to reply but in reality I cannot complain to his manager, all I can do is to try to make him feel guilty for ignoring me. And the email is nor answered after few days.
What would be a template for a first reminder?
And if the email is still not answered for another few days what would be a second reminder?
And similarly a third one?