NEED HELP ASAP

1. Barry is a lobbyist for an environmental conservation group. He travels to Washington, DC to try to convince legislators to vote against a recently-proposed bill that would allow oil companies to drill in national parks and wildlife preserves. Barry meets with a senator he has personally known since college. He buys the senator an expensive dinner in a restaurant with a private room. Over dinner, Barry asks the senator to vote against the drilling bill.

a) What is the unethical behavior in this situation?
b) What conflict(s) of interest could arise from this situation?