You advise hundreds of visitors every day and the satisfaction given at the end of your conversations is a reflection of the quality of your exchanges.
Be sure to note that the satisfaction score depends largely on the way you close a conversation. It's important to take the time to close each conversation because it's the last impression that you will leave on your visitor. 
Unfortunately sometimes the visitor is still unsatisfied despite all your efforts to help them and respond to their needs. 
It is possible to have a satisfaction score lower than 4.3/5.
It is possible to have a satisfaction score lower than 4.3/5. The score of 4.3/5 is the minimum satisfaction score to be achieved for each mission.
For your information, the Ibbü team always relies on a sufficient volume of conversation when analyzing your performance. So you don't have to worry when you have a single conversation with a poor rating. The best advice we can give you is to compensate for poor ratings with good ratings. To do this, you can encourage the visitor to rate you when you think the conversation went well.
In any case no panic if your satisfaction score is below 4.3/5, we will be vigilant and take the time to analyze your conversations. 
Moreover, as part of your mission it is important to accompany the visitors as well as possible and to do your best to satisfy them, even if sometimes it seems difficult