Synonyms for Dialog:

n.

communication (noun)
dialogue.
conversation (noun)
talk, argument, consultation, meeting, interview, conversation, seminar, parley, confabulation, conference, confrontation.
dialog (noun)
dialogue.
dialogue/dialog (noun)
confabulation, parley, discussion, conversation, chat, conference.
speech (noun)
dialect, chattering, circumlocution, spoken word, remark, speaking, debate, elocution, vocalization, babbling, locution, oral communication, patter, recitation, speech, talking, discussion, report, oration, chat, voice, prattle, chitchat, jabbering, allocution.

Other synonyms:

Other relevant words:
dialogue.