The correct matches are the following.
1) The change or amendment to the bill is called "Alteration."
2) A legislative meeting hall is called "Chamber."
3) To reach an agreement is called "Concurrence."
4) A meeting for discussion is called "Conference."
5) A group that was formed to reach an agreement on how the final version of a bill would be presented is called "Conference Committee."
All of these are terms used in US politics to describe some activity or institution in specific. Basically, these are terms frequently used by the members of the US Congress. They can revise and alter a bill, they meet in a chamber: the House of Representatives or the Senate. Their job is to reach an agreement to pass laws, in what is called concurrence. They have discussions or conferences to approve bills and to do that, they form Conference Committees.