Interview first or last?

I got an email to schedule an interview for either this Wednesday, or Friday, or next Monday or Tuesday. My question is, should I try to schedule it earlier or later. I don't want to go tomorrow, and then have them forget about me. Also, I don't want to be last, and have them already have made up their mind on who they want to hire. Any advice?
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WGU MS:ISA Completed October 30th 2013.