Is it correct the grammar using who + verb + S?
Why do you think the work is important?
The work like flight attendant it is important, because you are the person who keeps the passengers happy and calm, assisting them when they need help during all time flight and ensuring their safety in case of emergency.

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Here are a few corrections to your text:

The work of a flight attendant it is important, because you are the person who keeps the passengers happy and calm, assisting them when they need help at any time during the flight and ensuring their safety in case of emergency.

And yes, it is absolutely correct to use the third person 's' with the subject 'who'. 'Who' is a third-person singular pronoun and it would be a mistake to use any other verb form.

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