Farewells

Well, I have to go now - 

This is a common way to end a conversation without making excuses. “Well” here indicates a summing up, a reaching for a conclusion, but is otherwise meaningless.

See you later - 

Usually you only say this when you want to convey that you intent to see people later day rarely after that. Note that this expression is truncated for “I’ll see you later,” which is not only slightly more formal, but expresses a greater degree of certainty about meeting later the same day.

Bye - 

This is quite informal, but also very friendly.

Good night - 

This farewell is used when you are taking your leave at night ( or you’re signaling that you’re going to sleep ).

Good bye - This is a more formal farewell.