Bonjour - Pretty sure this is an obvious one, but it means “hello”!
Merci - Again, I think most people know this, it means “Thank you”.
S'il vous plaît - “Please”
Je m'appelle... - “My name is…”
Bon soir - This means “good evening”.
Bienvenue - Welcome!
Vous parlez angalais? - "Do you speak English?"
Ou sont les toilettes? - "Where's the restroom?"
Ecouteurs - This is the term for headphones
Quelle heure est-il - "What time is it?"
Qu’est ce-que tu veux boire? - This may be asked by flight attendants, and it means “What do you want to drink?”
Qu’est ce-que tu veux manger? - This is the same thing, but “What do you want to eat?”
Ça va? - “Are you okay/you are well?”
Au secours - “Help!”
Je suis - I am
Bisous - the kiss you're given on each cheek when you meet a familiar acquaintance. It's important to know when it's appropriate to do this. With formal people you aren't close to, or strangers, the interaction would be awkward and not appropriate at the time.