单项选择题

Questions 5 to 7 are based on the following passage.
I flew to San Francisco to take care of some business with Mr. Jordan. But as soon as I arrived, I got sick and couldn’t meet with him. I had to call our appointment off. Then, when I felt better I thought about visiting him at his home, but he lived too far away. I tried to telephone him during office hours, but he was busy. The receptionist said that Mr. Jordan would call me back, but he didn’ t. I gave up trying to make a new appointment because it would take more time and effort than I wanted to spend. A few days later, I saw a man on the street who looked like Mr. Jordan, and I called out to him. It was someone else. When I returned to my hotel that day, I found a message, which said that Mr. Jordan had gone out of town on some sudden unexpected business. I was sorry I had missed seeing him, but I really enjoyed my sightseeing in San Francisco.

Why did the speaker give up making another appointment().

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