Talking after washing for tzorchei haseudah is muttar. See Mishna Berura 166:2
http://hebrewbooks.org/pdfpager.aspx?req=49624&st=&pgnum=119
“Levad meyhadvarim shehheim ltzorech seuda D’mutar Lhafsik Lekulei Almah.
So in short Just say “bring us the matzos now.”