It does not matter what you call them.

You can call them reservor / reservee, or buyer / seller, or whatever. I would just use reservor / reservee.

--------------------------------------------------
Note added at 2002-03-03 13:29:16 (GMT)
--------------------------------------------------

Here are some references...

Reservee - Online Dictionary at DataSegment.com
... Reservee \\Res`er*vee\"\\ (r&ebreve;z`&etilde;r*vē\"), n. One to,
or for, whom anything is reserved; -- contrasted with reservor. ...
onlinedictionary.datasegment.com/word/Reservee/

bootlegbooks: Websters Revised Unabridged Dictionary 1913
... Re*serv\"ed*ly adv. — Re*serv\"ed*ness , n. Reservee ( Res`er*vee\" ) n. One
to, or for, whom anything is reserved; - - contrasted with reservor. ...
www.bootlegbooks.com/Reference/Webster/data/1302.html

GR No. L-34395 - [ Traduire cette page ]
... to the resolutory condition that such title is extinguished if the reservor predeceased
the reservee. The reservor is a usufructuary of the reservable property ...
www.lawphil.net/judjuris/juri1981/may1981/gr_34395_1981.htm...