If a user it trying to reset a password and is not getting an email, it is likely the user never validated their account. They will need to be sent a verification link to establish the account.
IMPORTANT NOTE: When an account is created the new user will receive a confirmation email. The user MUST use the link in the email to complete their registration within 30 minutes. If the user does not complete their registration within 24 hours, the welcome email will need to be resent by the administrator.