Psychological / emotional perspective: If a response is needed or if a reply is given there must have been a question. This will often have been a subconscious one. In dreams it is unfortunate that we sometimes have one without knowing the other.
[1]Material aspects: To reply is to respond, usually in words to a question or an action. In dreams any response we make should be carefully considered as to whether it reflects our feelings accurately in a waking situation.
[2]A spiritual response is one that affects every part of our being and is a reaching out to whatever we deem the ultimate to be.
An instinctive response is often one drawn from us by a situation that has personal resonance.
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