Linking packets in a dissector

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I am writing a dissector for ZWave serial port protocol, and I would like to link request/response packets somehow in UI.

The protocol does not have request/response IDs, but it says that responses to requests come in the same order they were sent, so it ought to be possible to match them. It also provides for "callback ID"s on requests that expect asynchronous responses in addition to synchronous acknowledgments, so some asynchronous responses can be matched to earlier requests, though these IDs can be reused.

I have read developer's guide about dissectors, but haven't found a way to say "this packet is a part of this request/response/multi-packet sequence". Is that possible? Have I missed some piece of documentation?