You want to impart both a sense of urgency and a sense of convenience.
You will, of course, need to provide enough information about your value proposition to make the person want to spend some time talking. But also, don’t talk too much, If you launch into a long sales pitch without finding out the other person’s thoughts, you can turn them off immediately. It is a dialogue, not a scripted monologue.
Don’t ever talk at someone. Give them time to come along with you.