Hang on.

Hang on.
Hang on" is a common phrase encouraging someone to wait or hold on. For instance, if you are on the phone and you need to ask the other person to wait for a moment, you might say, "Hang on, I need to check something." It's a casual way to politely ask for a little patience or a short pause in conversation or action.
Hang on, he's just sending the details now.
Wait a moment, he's just sending the details now.
Hang on a second, I need to grab my notes.
Wait a second, I need to grab my notes.
Just hang on till we get confirmation from the boss.
Just wait until we get confirmation from the boss.