A 38-year-old woman with a history of allergic rhinitis and childhood asthma (remitted for 10 years) presents with a 3-month history of exertional dyspnea and dry cough. Spirometry is normal (FEV₁ 92% predicted, FEV₁/FVC 0.82). She denies current wheeze or night-time symptoms. What is the most appropriate next step in management?

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