Lay out the benefits. You are pitching what your idea, your team, and your product will do for investors and for customers. This is the time to lay out your mission statement. Conclude with a call to action. Always end your pitch with a call to action.
Different audiences prompt different requests.
Ask friends and acquaintances if they know anyone who would be interested, who's working on something similar, or who's working in the investment world. Ask angels and VCs if they'd consider investing, if they'd take your call, or if they'd be willing to set up a meeting. If you're really in an elevator, offer to walk straight back to the office to talk more. Make it tangible. Throughout your pitch, talk in tangibles, not abstractions.