You have to take good care of your reliability. This is how your teammates will make their first impression of who you are.
It consists of your opponents' evaluation according to how well you schedule the matches, how quick you respond to their offers, how you behave on the court, whether you come on time etc.
If you miscommunicate from time to time, but you apologize and fix the mistake, you probably won't get a bad raiting. In case your reliability percentage is a bit lower, the only way to improve it is to get more reliable in the future.