C399 Economic benefit

I hung up the phone and went outside. I had just lit a cigarette when I saw a blonde woman in her thirties wearing a white coat. She must be a doctor. I hastily hid the cigarette behind me, intending to wait for her to pass before I smoked, but she stopped in front of me, smiled at me, and then spoke to me in English. The sentence was so long that I didn't know what she was talking about