B2
conversation that is written for a book, play, or film:
The play contained some very snappy/witty dialogue.
dialogue between Act Two begins with a short dialogue between father and son.
C2
formal talks between opposing countries, political groups, etc.:
enter into dialogue with The rebel leaders stated that they are willing to enter into dialogue with the government.
engage in dialogue The two sides have at last begun to engage in a constructive dialogue.