Received offer for domain via Email, what next ?

[admin]

I just received an offer for one domain name i own from the Vice President of an XYZ company.The email says that the XYZ company is interested in buying the domain name and asking for a quote price of the domain name. What should i do next ? I dont want to sound cheap by quoting a stupid price, neither do i want to quote a price too high.What should i reply ? Any suggestions are really welcome.EDIT : The company name is no way related to the domain name, so i guess it sounds like a reseller.EDIT #2 : OMG , the guys are offering 9000$ wtf, i cant believe it, and i was going to sell the domain on DP for 30$