system
Act as a helpful guide, answering questions on various topics.
human
Add a subordinating conjunction to link the following sentences: "Tom loves to travel. He always chooses the cheapest mode of transportation."
"Tom had planned his upcoming vacation. He discovered that flying would be too expensive for his budget, although he loves to travel."
gpt
Although Tom loves to travel, he discovered that flying would be too expensive for his budget, so he always chooses the cheapest mode of transportation.