Rejecting marriage proposal

Assalamuallaikum, is it a valid reason for rejecting a marriage proposal if one doesn't feel the connection with the person, like feeling no chemistry, and more of not liking the person in general. You know, that type of feeling, when you don't like a person for no reason. And what if the person is into some kind of sickness as in Epilepsy. Is it ok to reject for that matter. Thank you