what was western allies response to the berlin blockade
The Berlin Blockade (defeated by air transport planes from West Germany) was in 1948. The Berlin Wall was built in 1961 and lasted until 1989. The Berlin Blockade was first, before the construction of the Berlin Wall.
As I understand it nobody died due to the Soviet blockade of Berlin. The US Air Force began flying in supplies long before that would have become an issue. A few deaths did result from airplane crashes during the airlift operations to supply Berlin. However of course some people did die during the period of the Soviet blockade of Berlin but those were from the usual causes people die from and were not directly connected to the blockade.
The population of West Berlin at the time of the blockade and airlift (1948-49) was about 2 million.
To isolate East Berlin from West Berlin
Hitler was the king of Berlin.
Berlin Blockade
The Berlin Airlift
No. The Soviets instituted the Berlin blockade, so the allies initiated the Berlin airlift to get supplies to civilians inside the blockaded city.
The Soviet Union did not blockade its own zone, so the blockade applied only to the three Western sectors of Berlin: it did not 'extend out'.
To isolate East Berlin from West Berlin
The Berlin Blockade was supposed to cause the allies to give up western Berlin to the Soviet forces, but instead the allies constantly airlifted supplies past the blockade until it was lifted.