let me see
A phrase used to indicate that one is trying to think of or remember something or to look for some information. A: "When can I come in for an appointment?" B: "Let me see. There's an opening at 3 o'clock tomorrow, if that works for you."
let me see
Also, let's see. I'm thinking about it or trying to remember, as in Let me see, I'll be in Boston tomorrow and the next day. This idiom was first recorded in 1520.
ˌlet me ˈsee/ˈthink
used when you are thinking or trying to remember something: Now let me see — where did he say he lived?