Is there a quote from the play to show that neither the Montagues nor Capulets offer a truce?
I do not agree with the premise of this question. I do agree that neither side actually says "let's have a truce." However, it seems clear to me that, at the end of the play, the two families have decided to learn from their mistakes and to make peace.
One quote that I can offer to prove this would be the following quote from Act V, Scene 3.
To me, the part about "brother Montague" and "give me thy hand" really show that they are going to stop fighting.
I would also argue that the Prologue tells us that they are going to stop fighting when it says
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