"Can we close sooner?" asks my seller while I look for buyers...

[Chris Gould]

I have a house under contract in Toledo, Ohio that I'm looking to wholesale. Just received the signed contract back and I've started marketing the house to investors in the area. The homeowner then asks me when we can close by even though September 30th was listed on the contract. I said mid-September and she gets mad saying she thought we would be closing sooner than that and that she had "verbal cash offers" from other investors. 

How should I handle this situation? And in general, when wholesaling, what is the best reasoning to give for a 2 month closing window? 

I want to be honest with these people and set realistic expectations for the process. 

Thanks BP.