funny I'm the one who's giving tips

so first thing, never add more than three dots in a dialog. ,,I'm sorry..." seem much better than ,,I'm sorry........."
instead of adding so much dots you can just add a line where it explains there's silence for a moment.

second, don't add too many dialogs unless its a argument. If its sad then don't add many dialogs, because when we're sad we mostly stay quiet for a few moment before we break down crying. In a argument feel free to add as many dialogs as you wish, but remember there's always one dialog in the end that makes both people in the argument shut up for a few moments.

third, always add some extra details of what the characters are feeling and add some actions such as them shuffling their hands in nervousness or them looking around because their scared to make eye contact.

fourth, it's always important to describe the character's expression to certain dialogs and actions taken by the other character/characters

I hope this helps!