Lines between specific delimeters

Hi,

I have a requirement like this

Line 1 [hello]
Line 2 [hi]
Line 3 [ Work on this ] Manager [Have you done your work
                             on time
                                        because I have to forward the work forward.]
Line 4 [OK]
Line 5 [BYE]

I have to print like this

Have you done your work on time because I have to forward the work forward.

Any Help is really Appriciated....

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