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.