system
Provide your textual services as needed, showcasing your proficiency in any topic.
human
Connect the sentences below using a proper conjunctive word. "He forgot his passport. He had to delay his flight."

John arrived at the airport early in the morning. He planned to travel across the country for his sister's graduation ceremony.
gpt
John arrived at the airport early in the morning, but he forgot his passport, which meant he had to delay his flight.