HARRIS: Forget for this moment smog, cars, a restaurant, skating — remember only this: a kiss may not be the truth, but it is what we wish were true.

Steve Martin (b. 1945) American comedian, actor, writer, producer, musician

L. A. Story (1991)

The above text is what is actually said in the movie. Most sources, including IMDb, use a slightly longer form of the quote, possibly from the script.

Forget for this moment the smog and the cars and the restaurant and the skating and remember only this. A kiss may not be the truth, but it is what we wish were true.