For a successful interview, Jim Bright suggested using the popular Star formula: point, reason, situation, task, action, result, point. Here is the example:

"I am great at customer service [point] because I listen carefully to my customers [reason]. For instance, last month, a key client wanted to change their payment schedules [situation]. I knew this involved creating a new account in the system and checked whether the client was happy with this solution [task]. She said she was, so I created the account the same day [action]. The client's request was fulfilled promptly and they were happy [result]. This exemplifies my customer service skills [repeated point]."