Greetings

In most occasions say "Hi" and address the person with first name.

- Nice to meet you, X.
-Nice to meet you, too.

-It is noce to meet you
- you too.

-Nice to meet you
-Glad to meet you
-It is a pleasure  to meet you
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- I am Philip. Please call me Phil

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-How are you?
-How's everyhitn?
-How's it going?
-How are things going?
-How are you?
-How are things?
-What are you up to?
-What have you been up to?
-What are you up to tomorrow?
- fine.
- I'm fine.
- Not bad
- Great.
-So-so
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Note: In the US, "How are you" is used as "Hi". In response just say "I'm fine".  If the person asked more question provide longer answers.

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Good evening is a greeting and means "Hello". "Good night" means bye.

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-See you tomorrow.
- Ok. See you.

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- I havent seen you in a long time
- long time no see

- no wonder (it is understandable, I'm not surprized, so that's why)

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-What's up Jody?
-Not much. Just reading the paper.

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How is it going?
Pretty good, thanks.

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-bye.
-goodbye.
-take care.
take it easy.
-see u later