I think I would ask for what I want. If I want a face to face meeting I would ask for that, and suggest a date range, and possibly even a day and time. If I knew it would be short, I would give and estimate of the time I need (they know that this will be an estimate and may go longer). I would also ask for a reply by a certain date (like the following day) and if I did not receive a reply, I would forward the email and ask if the suggested date/time will work for them.

The squeaky wheel...