You should send your scheduling request at least 2-3 weeks before the date of the meeting.
SAMPLE SCHEDULING REQUEST
[Scheduler] Office of Representative [Name] [Local Address]
[date]
Dear Mr/Ms [Scheduler],
I am writing to request a half-hour meeting with Representative [name] any time [range of dates].
I am a constituent of Representative [name] and am involved in [church groups, community org, etc].
I would like to meet with Representative [name] to discuss my concerns about [issue—war in Iraq, situation with Iran, etc]. I will be joined at the meeting by [names and affiliations of other people coming on the visit.
Thank you for your attention to this matter. I look forward to speaking with you.