How to Spot a Scam Response

Sometimes I rent out my house when I'm away for the weekends (never fear, I tuck away the mixing bowls my sister gave me when I was in college, my signed favorite books, my toolbox and some other things). Sometimes I get dubious responses:

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Hi

My name is Sandra Brown, I saw your add on Craigslist and was wondering if the last two weekends in January are  still available?  I won't know...