Update nested object on create - ruby-on-rails

Question

I have 3 models :
user.rb
class User < ApplicationRecord
has_one :profile, inverse_of: :user, dependent: :destroy
accepts_nested_attributes_for :profile
has_many :bookings, inverse_of: :user, dependent: :destroy
has_many :owner_bookings, foreign_key: 'owner_id', class_name: 'Booking'
end
profile.rb
class Profile < ApplicationRecord
# mount_uploader :avatar, AvatarUploader
belongs_to :user, inverse_of: :profile
accepts_nested_attributes_for :user
end
booking.rb
class Booking < ApplicationRecord
belongs_to :user
belongs_to :owner, class_name: :User
belongs_to :poi
end
After a create booking, I would like to update the user profile (if some changes)
my form :
<%= simple_form_for [#poi.poitable, #booking] do |f| %>
<%= f.simple_fields_for #user.profile do |profile| %>
<%= profile.input :first_name,
input_html: { value: #user.profile.first_name } %>
<%= profile.input :last_name, input_html: { value: #user.profile.last_name } %>
<% end %>
<%= f.input :owner_id, input_html: { value: #poi.user.id } %>
<%= f.input :poi_id, input_html: { value: #poi.id } %>
<%= f.input :user_id, input_html: { value: #user.id } %>
<%= f.submit %>
<% end %>
booking_controller :
def new
#user = current_user
#poi = Sleep.friendly.find(params[:sleep_id]).poi
#booking = Booking.new
end
def create
#user = current_user
#poi = Sleep.friendly.find(params[:sleep_id]).poi
#booking = Booking.new(booking_params)
if #booking.save
#booking.user.profile.update_attribute(booking_params[:user_profile_attributes])
end
private
def booking_params
params.require(:booking).permit(
:poi_id,
:owner_id,
:user_id,
user_profile_attributes: [:user_id, :first_name, :first_name],
)
end
booking_params return only :poi_id, :owner_id, user_id, how can I get user_profile params to update #user.profile ?