By the way

We use this expression to give new or further information about something.

You can use this phrase in ………… language.
 Spoken
 Formal
 Informal

Example 1
A: Is this seat taken?
B: Not at all.
A: Thanks. By the way, I’m John.

Example 2
A: I just met Mary on her way home.
B: By the way, did you know she quit her job?