Whether you're talking to a customer or colleague, the same principles of effective communication apply:
01
If you contact someone with a question or query (for example, someone at the GP surgery with a question about a patient), be sure to have all the information you need to hand, and organised in a logical way, so that you can get the answers or solutions you need.
02
Speak clearly and at the right speed and volume otherwise the listener may miss an important point.