Hi aspirant,
The job of cabin crew is to ensure comfort to the passengers on board. So, in this job you need some particular skills which you need to practice. You need to keep few things in mind before attending the cabin crew interview :-

• First of all you should know about the job, research about it, ask any ex cabin crew. Get clarity about your post and the interview process.
• You have to be fluent at least in one common language which the company demands you to speak. English is a must, you should be very fluent in english then you'll have good chance of being selected
• Being polite, friendly & humble are those qualities which they look for in the candidates during the interview.
• Keep your posture upright and your body language should be appropriate. You have to confident and your expressions should match your body language.
• Have an outstanding resume .
• Your attire should be professional, formals are preferred.
• Keep an eye connection with the interviewee while interacting with them.
• Be relevant to the questions & do not lie.

I hope this helps.
Thank you.