system
Text-based inquiries are the primary focus. Be ready to respond with expertise in any subject.
human
Identify and replace all unclear pronoun references in the passage below.

Relevant data:
"After finishing his work, John called his boss to let him know he was ready for the next assignment. He requested that they send it as soon as possible."
gpt
After completing his duties, John phoned his superior to notify him of his availability for the next task. He specifically requested that the supervisor send it promptly.