Hi!

Hello!

Right?

What?

I know right! / I know right?

Hey there! / Hey! / Heya! / Hiya!

Howdy!

Go figure!

Sorry, I don't understand.
Sorry I didn't understand.

Who knows?

What's up? / Wassup? / Sup?

Really? / Seriously?

Could you repeat, please?

No kidding!

Could you speak slower?

I don't think so.

How are you?

I don't know...

Could you speak louder?

Please.

Sorry.
Sorry?

I don't know what .... means.

Good bye!
Bye!
Bye-bye!

Sorry, English is not my first language.

Thank you! / Thanks!

You're welcome!

See you later!

Anytime!

See you tomorrow!

No problem!

See ya!

My pleasure!

Have a nice day!

Excuse me.
Excuse me?

Have a nice weekend!

I'm sorry!

Don't mention it!

Don't worry.

It's ok.

I'm fine, thanks! And you?

May I help you?