How can I play a animation once?

Hello, sorry if this is an easy question, I am new to Unreal engine. I’ve an AI who comes to my firstperson character. I want to keep playing the animation when he is next to me, but whenever I want him to strat running after me again. This is the blueprint I have now:

Use a Do Once Node.

In UE there are animation montages assets used for those cases. Watch these tutorials