At the simplest level, this requires that you act as normally as possible. Further, only say things that are sympathetic, non-judgmental, patient, and accepting.
[header] How to console someone [title] Tell the person that you care. [step] There's no " right " thing to say when someone is in emotional pain-especially when there is a perfectly reasonable reason for their suffering. Choose your words, your voice, and your manners in terms of what will convey that you care.