'No Reverse Match at /showing file i just got the error of it

got an error while doing the code.I want to redirect by button to other page but it is showing me the error I have not done any more coding just the simple code that we use to do I had written it nothing more NoReverseMatch at /showing Reverse for '<WSGIRequest: GET '/showing'>' not found. '<WSGIRequest: GET '/showing'>' is not a valid view function or pattern name. my code of views.py

from django.shortcuts import redirect, render
from django.contrib.auth import authenticate,login
from user.forms import *
from django.contrib import messages
from user.models import *

from user.models import Orders

# Create your views here.
def home(request):
    return render(request,'home.html')

def login(request):
    if request.method=='POST':
        username=request.POST['username']
        password=request.POST['password']
        userm=authenticate(user=username,passe=password)
        if userm is not None:
            login(request,userm)
            messages.success(request,"You have login successfully...")
            return redirect("home")
        else:
            messages.error(request,"Invalid Username or password...")
            return redirect("login")
    else:
        return render(request,'base.html')

def register(request):
    if request.method=='POST':
        fm=Userregistration(request.POST)
        if fm.is_valid():
            fm.save()
    else:
        fm=Userregistration()
        return render(request,'register.html',{'form':fm})

def Orderreg(request):
    if request.method=='POST':
        fm=Orderbook(request.POST)
        if fm.is_valid():
            pi=fm.cleaned_data['parcel_info']
            pq=fm.cleaned_data['parcel_qty']
            pw=fm.cleaned_data['parcel_weight']
            um=fm.cleaned_data['unit_mass']
            d=fm.cleaned_data['desti']
            ord=Orders(parcel_info=pi,parcel_qty=pq,parcel_weight=pw,unit_mass=um,desti=d)
            ord.save()
            fm=Orderbook()
        return redirect('service')
    else:
        fm=Orderbook()
        u=Orders.objects.all()
    return render(request,'service.html',{'form':fm,'us':u})

def contact(request):
    return render(request,'contact.html')


def about(request):
    return render(request,'about.html')

def show(request):
    return redirect(request,'showing.html')

urls.py

from django.urls.conf import path
from user import views


urlpatterns = [
    path('',views.home,name='home'),
    path('home',views.home,name='home'),
    path('login',views.login,name='login'),
    path('register',views.register,name='register'),
    path('about',views.about,name='about'),
    path('service',views.Orderreg,name='service'),
    path('contact',views.contact,name='contact'),
    path('showing',views.show,name='show'),
]

my showing.html page is empty code of service.html

{% extends 'base.html' %}
{% block body %}
{% load static %}
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title></title>
        <meta name="description" content="">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
        <link rel="stylesheet" href="{% static 'css/bootstrap.css' %}">
    </head>
    <body>
        <form action="" method="POST">
            {% csrf_token %}
            <section class="" style="background-color: #b6977d;">
                <div class="container h-200">
                  <div class="row d-flex justify-content-center align-items-center h-100">
                    <div class="col-lg-12 col-xl-11">
                      <div class="card text-black my-5" style="border-radius: 35px;">
                        <div class="card-body p-md-5">
                          <div class="row justify-content-center">
                            <div class="col-md-10 col-lg-6 col-xl-5 order-2 order-lg-1">
                              <p class="text-center h1 fw-bold mb-5 mx-1 mx-md-4 mt-4">Place order</p>
                              {{form.as_p}}
                              <input type="submit" class="btn btn-success btn-block" value="Order">
                              <a href="showing" class="btn btn-success btn-block">Show my Order</a>
                            </div>
                            <div class="col-md-10 col-lg-6 col-xl-7 d-flex align-items-center order-1 order-lg-2">
              
                              <img src="/static/user-registration-removebg-preview.png" class="img-fluid" alt="Sample image">
              
                            </div>
                          </div>
                        </div>
                      </div>
                    </div>
                  </div>
                </div>
              </section>
        <script src="{% static 'js/jquery.js' %}"></script>
        <script src="{% static 'js/poper.js' %}"></script>
        <script src="{% static 'js/bootstrap.js' %}"></script>
    </body>
</html>

{% endblock body %}

python django

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'No Reverse Match at /showing file i just got the error of it

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