Please advise me just one problem?

Dont worry, you are worrying to much !! You should just advise the person to put their hand on their mouth when they are coughing so you dont have to worry. Iam sure when you do that, you will start to gett over you cough. You just have to take a deep breath and try to start from all over again. Dont worry, iam sure you are going to get over it. But when your coughing, i dont think there would be anything coming out of your mouth, so YOU DONT HAVE TO WAORRY !!