I have not done this shop either but what I generally do is to make myself a cheat sheet by reading through the questionnaire before the shop and writing down the questions I will need to gather data for listing some of the salient points they want to know about. So for your shop I might have written down "Open ended questions asked what, when, how" and leave a space so that after the shop I will go through in my head or use what ever notes I might have to fill those in from where ever they occurred during the shop. Leave a space to write in your answer then go on to the next question...which might be titled care, maintenance, warranty, advice.
Many questions recur in almost every shop such as restroom, cleanliness etc. For those just note discrepancies.
No conversation is going to go the same way each time so you will rarely have the questions come up in order of your conversation.
If this report is structured so that there are small narratives after each question then usually what they want there is just the answer to the question asked at that point. It does not need to be put into context but it generally needs to be written in full sentences and not as bullet points. So you might say the salesperson asked you what xxx, how xxx and where xxx during your conversation. They just want to know how the sales person handled finding out what your needs were. When there is a narrative box at the bottom of the page that asks for the story of the shop that is where you might give your answer in order of how things happened.
See if the msc provides a sample report somewhere on the site and take a look at how the sample is done and then follow that.