Design an instruction set for a GPT model to create a haiku poem.
user
Instruct the GPT model to generate a haiku poem with five syllables in the first line, seven syllables in the second line, and five syllables in the third line. For example, input "Create a haiku poem" and the output should be: 

Under the stars 
The night breeze singing its song 
In its silent tones.
assistant