Unless two people have known each other for years, the first date is likely to be quite awkward. It is a time for the couple to begin getting to know each other. They need to take the time to discuss their outlook on life and see if they have anything in common. If they disagree on basic issues, there might be no reason for a second date. If they are in agreement on many issues, this could be the beginning of a relationship.
It is important to be honest and upfront on a first date. If two people cannot agree with each other, a second date will not help. There is also the issue of being led to believe something that is not true. Many people will believe what another person says until they find out differently. Once dishonesty has been discovered, a relationship is difficult to continue. Being honest from the beginning will lead to a good relationship if the first date works out well.