Your date might be lovely and you click, or they could be good but not for you. Worst case, they may be bigoted, sexist, or boring.
First dates might be intimidating since you don't know enough about the individual to decide whether you like them
It's hard to judge chemistry online or over the phone; you must meet in person.
"Chemistry is frequently subtle and intuitive
Be polite and courteous if there's no chemistry. You don't need romantic sentiments to enjoy a date, so thank your date but be clear if asked for a second.
If you enjoyed the night and want to know your date better, tell them.
It's better to be honest with yourself and your date so you don't waste time.