Assert (DAMSL): The Assert tag is used when the speaker is trying to change the beliefs of the hearer. If this is not true, then a further distinction is made depending on whether the claim has been made previously in the dialogue or not (when it is tagged as Reassert or Other respectively).
Inform (DIT): Speaker S wants to make the information that forms the semantic content of the inform act known to addressee A; S believes the semantic content to be true.
Explain (HCRC MapTask): An EXPLAIN states information that has not been directly elicited by the partner. (If the information were elicited, the move would be a response, such as a reply to a question.) The information can be some fact about either the domain or the state of the plan or task, including facts that help establish what is mutually known.
Update (LINLIN): User provides information to the system.
Statement (SWBD-DAMSL): Statements are the most common label in SWBD-DAMSL, comprising 45% of the tokens. One of the SWBD-DAMSL/DAMSL mapping difficulties occurs with statements. SWBD-DAMSL statements are not differentiated into DAMSL’s “Assert”, “Reassert” and “Other Statement”. 
Inform (TRAINS): An inform act in the TRAINS domain is generally either in response to a question, or is a situation setting action that describes background information necessary to understand the problem. Inform is the default assignment for acts in this class if none of the following acts seem appropriate.Inform (Verbmobil): The label INFORM is reserved for cases where none of the categories REQUEST, SUGGEST, COMMIT or FEEDBACK apply. If not enough information is available in the context to label the given dialogue segment as any of those it can be labelled as INFORM. 