When we daven for the right shidduch we daven that Hashem should send us the right one and we should recognize and feel it. If it isn’t the right one we should be protected form making the wrong decision.
Please Hashem put the feeling in my heart, please bring us together if it is the right one and protect me form falling for the wrong one.
If we really say it and mean it, then when we get a “not for now” reply we are grateful for the Hashgacaha pratis of Hashem that protected me.