Speak Different !

Facts: 

Hindi language is made up of 11 vowels and 35 consonants.
English language is made of 5 vowels and 21 consonants.
Spanish language is made up of 27 alphabets.
Mandarin Chinese is made up of over 100,000 Chinese characters.

Greetings and introduction: 

Hindi - Namastey. Aap kaise hai? (नमस्ते | आप कैसे हैं ?)
English - Hello. How are you?
Spanish - Hola. Como estas?
Mandarin Chinese - Nǐ hǎo ma (你好吗)

Hindi - Mera naam Aashish hai (मेरा नाम Aashish है)
English - My name is Aashish
Spanish - Mi nombre es Aashish
Mandarin Chinese - Wǒ jiào Aashish (我叫Aashish)

Hindi - Aapase milakar achchha laga (आपसे मिलकर अच्छा लगा)
English - Nice to meet you
Spanish - Encantada de conocerte
Mandarin Chinese - Hěn gāoxìng jiàn dào nǐ (很高兴见到你)

Most spoken word in the world: 

Hindi - Thik (ठीक)
English - OK
Spanish - De acuerdo
Mandarin Chinese - Hǎo de (好的)

Universal word i.e. common across all languages: 
Not available yet. 
Though 'huh' and 'mama' are identified, but are still debatable. 

How to thank: 

...with a smile 😊
Hindi - Dhanyavaad (धन्यवाद)
English - Thank you
Spanish - Gracias
Mandarin Chinese - Xièxiè (谢谢)