Please Debug it if it has errors, and provide me output

#!/bin/sh       # Tells the OS (Operating System) to use the Bourn Shell 
 
booking()        # Function called welcome.
{
clear           # Clears the screen as soon as the script starts.
 
echo ""         # Echo's blank lines to screen.
echo ""
echo ""
echo " ***************************Welcome to Room Booking Services*****************************"
echo ""
 
date +"You are logged in at $HOSTNAME, as $USER. It is %c"
 
echo "Please Enter Name >>>\c"    #Waits for user to enter information.
read NAME                         #Reads information entered, and puts
                                  #it into NAME  (a variable)
 
echo "Please Enter No. of Days >>>\c"    #Waits for user to enter information.
read DAYS                         	 #Reads information entered, and puts
                                  	 #it into DAYS  (a variable)
 
echo "Please Chose Size of Room >>>\c"    
echo "     S or s ? Single Bed"
echo "     D or d ? Double Bed"
echo "     T or t ? Double Bed >>>\c"     #Waits for user to enter information.
read SIZE                         	 #Reads information entered, and puts
                                  	 #it into SIZE (a variable)
 
if [ $SIZE -eq "s" | $SIZE -eq "S" ]
then
    echo val = $DAYS * 150
elif [ $SIZE -eq "d" | $SIZE -eq "D" ]
then
        echo val = $DAYS * 210
elif [ $SIZE -eq "t" | $SIZE -eq "T" ]
then
    echo val = $DAYS * 250
else 
    echo "Invalid Size Was Selected"
fi
 
echo " ***************************Billing Details are as Follows*****************************"
echo ""
echo "Customer Name:  "
echo $NAME
echo "No. of Days:  "
echo $val
echo "Total Calculated Amount:  "
echo $val
 
}           # End of function called booking
 
# Below is the  Start of the main body of program (the while loop)
 
 
clear            # Clears the screen
 
while true       # True is a statement that returns true (1).  So by saying
do               # while true  it is like saying "do this until something 
                 # happens to be false (like hitting ctrl C or delete)
    echo ""
    echo ""
    echo "			Room Booking Services"
    echo ""
    echo ""
    echo ""
    echo "		1. Make a Room Booking"  
    echo "		2. Exit From the System
    echo ""
    echo "Enter Option >>>\c"        
        
 
read ANS           # Waits for user to enter something
                   # and stores the input in $ANS
 
case $ANS in 
 
	1 )  booking;;           # If $ANS is 1 call booking 
 
	2 )  clear; exit;;      # If $ANS is 2 clear screen and exit
              
        * ) echo "INVALID CHOICE!"; sleep 2; clear;;  # Echo the error message
                                                      # sleeps 2 seconds and 
 					              # clears the screen
esac    
done