in my last if statement. It does not matter if I input yes or not. my code always output "SOLD OUT". I don't know why.

SERVICE_CHARGE = 2
TICKET_PRICE = 10
tickets_remaining = 100
#create the calculate function, it take the number tickets and return
# return TICKET_PRICE * num_tickets
def calculate_price(number_of_tickets):

    return TICKET_PRICE * number_of_tickets + SERVICE_CHARGE

while tickets_remaining >= 1 :
    print("there are {} tickets".format(tickets_remaining))
    name = input("what is you name? ")
    num_tickets = input ("how many tickets would you like {}? ".format(name))
    #Expect a ValueError to happen and handle it appropiatly...remember to test it out!
    try:
       num_tickets = int(num_tickets)
                    #Raise a ValueError if the request is for more tickets than there are available.
       if num_tickets > tickets_remaining :
                    raise ValueError("Sorry, There are only {} tickets remaining".format(tickets_remaining))
    except ValueError as err:
            #Include the error text in the output.
          print("Oh no!, you don't know what an integer is. {} please try again".format(err))
    else:
        amount_due = calculate_price(num_tickets)
        print("the total due is {}".format(amount_due))
        should_proceed  = input("do you want to proceed? Y/N ")
        if should_proceed == "yes" or "Yes" or "YES":
           print("SOLD OUT")
           tickets_remaining -= num_tickets
        else:
           print("thanks, {}, have a nice day".format(name))
print("the tickets are SOLD OUT")