How can I search specific existing time of booking in Ruby on Rails?

For example, I will select a time and if I click "search", it will list all booking in that time.

on my database: booking_time: '2000-01-01 8:00:00'

This is the time want to search: '2000-01-01 8:00:00'

but the system output is: Booking time is available

why? i enter '2000-01-01 8:00:00' but it is existent in the database.. what is the problem?

new.html.rb

<%= form_for @search, html: {class: "pure-form"} do |s| %>
  <%= s.time_select :search %>
<% end %>

search.rb

class Search < ActiveRecord::Base

  def search_bookings
    bookings = Booking.all
    bookings = bookings.where(booking_time: search) if search.present?
    bookings
  end

end

show.html.erb

<% if @search.search_reservations.empty? %>
      "Booking time is available."
   <% else %>
      "Booking time is already exist."
  <% end %>
<% end %>