how to say good-bye?(sentence)

i have a meeting soon.

i have an engagement soon.

i have an engagement very shortly.

i have an date very shortly.

i think i'd better go now.

i think i should go now.

i think i ought to go now.

i think i must go now.

it's getting dark.

it's getting dark outside.

i've to go quite soon.

i must go quite soon.

i must leave quite soon.

i've got to go leave in a few minutes.

it was fun to get together again.

it was exciting to get together again.

it was exciting to talk to each other.