chat vs. dialogue and conversation

[Sergey]

Test No. incompl/inter-13 "At the Theatre", question 4

Many people go to the theatre not to see a play where the plot is complicated but to listen to the brillant ......... between the actors.

(a) dialogue
(b) chat
(c) conversation
(d) comments

Test No. incompl/inter-13 "At the Theatre", answer 4

Many people go to the theatre not to see a play where the plot is complicated but to listen to the brillant dialogue between the actors.

Correct answer: (a) dialogue

Your answer was: incorrect
Many people go to the theatre not to see a play where the plot is complicated but to listen to the brillant chat between the actors.
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Why word chat doesn't fit in here?

Sergey

[Torsten]

A chat is an informal talk about private issues. You can have a chat with your friends - actors perform dialogues.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[hanen]

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[Katarzyna]

'brilliant' not 'brillant'

That's all for today, I promise

Regards:)

[Rebecca]

Hello,
Why don't we use 'conversation'?
thanks a lot.

[Tamta]

Many people go to the theatre not to see a play where the plot is complicated but to listen to the brilliant ......... between the actors.

(a) dialogue
(b) chat
(c) conversation
(d) comments

correct sentence:
Many people go to the theatre not to see a play where the plot is complicated but to listen to the brilliant dialogue between the actors.

Correct answer: (a) dialogue

Your answer was: incorrect
your sentence:
Many people go to the theatre not to see a play where the plot is complicated but to listen to the brilliant conversation between the actors.

Could you explain to me please,why can't I use "conversation" here?
What is the difference between "dialogue" and "conversation"?

Thanks in advance
Tamta