[Python] updating current value in flet

Good evening, Based on tutorial here : Flet tutorial

i am following the codes , everything and i would like to ask one question, here is my code :

import flet as ft
from flet import *

def main(page:ft.Page):
greeting =ft.Ref[ft.Column]()
def hello_here(e):
greeting.current.controls.append(ft.Text(f'hello {first_name.current.value} {last_name.current.value}'))
first_name.current.value =""
last_name.current.value =""
first_name.current.focus()
page.update()

page.title="My greatings"
first_name =ft.Ref[ft.TextField]()
last_name =ft.Ref[ft.TextField]()

page.add(
ft.TextField(ref=first_name,label="Enter First Name",autofocus=True),
ft.TextField(ref=last_name,label="Enter Last Name"),
ft.Column(ref=greeting),
ft.ElevatedButton(text='Say Hello',
on_click=hello_here)

)


ft.app(target=main)


if i run it :flet flet_ref_example.py

i got this result :

as you see, every time, we are adding elements, it is printed on page one following to another, is it possible to make a simple correction and old text should be replaced by new one? i think this line should be corrected

greeting.current.controls.append(ft.Text(f'hello {first_name.current.value} {last_name.current.value}'))


but how?

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