I have a meeting soon.

I have an engagement soon.

I have an engagement very shortly.

I have a 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 wonderful to get together again.

It was exciting to get together again.

It was exciting to talk to each other.