what code can I add to create a loop that allows the customers to select multiple services? and also adds the total for everything selected at the end

My code:

# Function to calculate the total cost based on user choice

def calculate$\_$total$()$:

# Initialize service costs in a dictionary for maintainability

services $=\{$

$\text{'}$B$\text{'}$: $\{\text{'}$name$\text{'}$: 'Boarding', 'cost': $35\},$

$\text{'}$W$\text{'}$: $\{\text{'}$name$\text{'}$: 'Walking', 'cost': $20\},$

$\text{'}$D$\text{'}$: $\{\text{'}$name$\text{'}$: 'Daycare', 'cost': $20\},$

$\text{'}$H$\text{'}$: $\{\text{'}$name$\text{'}$: 'Homecheck', 'cost': $35\}$

$\}$

# Get customer and pet details

customer$\_$name $=$ input$("$Please enter your first and last name: $").$strip$()$

pets$\_$name $=$ input$("$Enter the name of the pet $($and type$)$: $").$strip$()$

# Welcome message

print$($f$"$

Hello $\{$customer$\_$name$\}$ and $\{$pets$\_$name$\}!")$

print$("$Welcome To Lisha's Paw$-$sitive Vibes Extended Stay

$")$

# Display available services and costs

print$("$Our services and prices:"$)$

for key, value in services.items$()$:

print$($f$"\{$key$\}$: $\{$value$[\text{'}$name$\text{'}]\}-$ $$\{$value$[\text{'}$cost$\text{'}]\}")$

# Get user choice of service

service$\_$choice $=$ input$($

$"$

Choose a service $($Boarding $($B$),$ Walking $($W$),$ Daycare $($D$),$ Homecheck $($H$))$: $"$

$).$upper$()$

# Initialize total cost

total $=0$

# Validate service choice and calculate cost

if service$\_$choice in services:

quantity $=$ int$($input$($f$"$Enter the number of $\{$services$[$service$\_$choice$][\text{'}$name$\text{'}].$lower$()\}$ sessions$/$days$/$nights: $"))$

total $=$ services$[$service$\_$choice$][\text{'}$cost$\text{'}]*$ quantity

else:

print$("$Invalid service choice!"$)$

exit$()$

# Apply military discount if applicable

military$\_$discount $=$ input$("$Are you prior or current military $($yes$/$no$)$: $").$strip$().$lower$()$

if military$\_$discount $==$ "yes":

discount$\_$rate $=5$ # $5\%$ discount

discount$\_$amount $=($total $*$ discount$\_$rate$)/100$

total $-=$ discount$\_$amount

print$($f$"$Thank you for your service! You received a $5\%$ military discount of $$\{$discount$\_$amount:$\mathrm{.}2$f$\}.")$

elif military$\_$discount $=="$no$"$:

print$("$No military discount applied."$)$

else:

print$("$Invalid input. Please enter 'yes' or $\text{'}$no$\text{'}.")$

exit$()$

# Display the total cost

print$($f$"$

Your total after discounts is: $$\{$total:$\mathrm{.}2$f$\}")$

return total

# Function to schedule and repeat dates

def schedule$\_$dates$()$:

import datetime

print$("$

Scheduling your service..."$)$

# Get the starting date for the service

start$\_$date$\_$input $=$ input$("$Enter the start date for your service $($YYYY$-$MM$-$DD$)$: $").$strip$()$

try:

start$\_$date $=$ datetime.datetime.strptime$($start$\_$date$\_$input, $"\%$Y$-\%$m$-\%$d$").$date$()$

except ValueError:

print$("$Invalid date format! Please use YYYY$-$MM$-$DD$.")$

return

# Get the number of days the service repeats

repeat$\_$days $=$ int$($input$("$Enter the number of days the service will repeat: $"))$

# Print out all scheduled dates

print$("$

Here are your scheduled dates:"$)$

for i in range$($repeat$\_$days$)$:

scheduled$\_$date $=$ start$\_$date $+$ datetime.timedelta$($days$=$i$)$

print$($f$"$Day $\{$i $+1\}$: $\{$scheduled$\_$date$\}")$

# Main function to run the program

def main$()$:

calculate$\_$total$()$ # Calculate service cost and handle discounts

schedule$\_$dates$()$ # Schedule dates for the service

# Run the program

if $\_\_$name$\_\_=="\_\_$main$\_\_"$:

main$()$