Would you have allowed your son/daughter to go on this date if he/she had wanted to?

My teen daughter and her friend were at the mall. While they were there, a guy came up to them and asked my daughter to go out on a date with him (she thinks he was around 18). Apparently he got down on one knee, with his hands clasped together, like he was proposing, and asked her. She doesn’t know him, and she wasn’t really interested, she says she tried to be nice about it, and she told him no.