Display dialog, getting both text returned and button returned

Question

I am most of the way through my first major project in applescript. I want to get both the text returned of and the button returned of a dialog box. Is this possible?
So basically i want to do the below without having the dialog box run twice.
set thebutton to the button returned of (display dialog "Already Assigned!" & return & "Please assign a new letter" default answer "…" buttons {"Cancel", "Delete Previous Location for this Letter", "OK"} default button "OK")
set theLetter to the text returned of (display dialog "Already Assigned!" & return & "Please assign a new letter" default answer "…" buttons {"Cancel", "Delete Previous Location for this Letter", "OK"} default button "OK")
Rich

Answer 1

Well thanks for the fast response, both work fine, cheers. That problem is now sorted.
However while i was waiting for the responses i came across another problem, i would like to delete a specified item from a list. This is not the actual script but i was using it to test the syntax. So basically how would i go about deleting the the letter P from a list PQ
set letterlist to {}
display dialog letterlist as string
set namep to "P"
copy (namep) to end of letterlist
set nameq to "Q"
copy (nameq) to end of letterlist
display dialog letterlist as string
set theKeyPressed to "P"
repeat with each_item in letterlist
if each_item contains theKeyPressed then
delete each_item
end if
end repeat
display dialog letterlist as string
Rich