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No sooner ... (to enter) the room than a young man ... (to come) up to me with a glass of champagne … (to be) sure it (to be) the first time I ... (to see) him in my life and I ... (not \ to know) his name but half an hour later … (still \ to ask) me questions about my relatives and … (to tell) me something about his new business.

No sooner ... (had I entered) the room than a young man ... ( came) up to me with a glass of champagne … (I was) sure it (was) the first time I ... (had seen) him in my life and I ... (did not know) his name but half an hour later … (was still asking) me questions about my relatives and … (telling) me something about his new business.