Cleaned up the Ticket Sale Project... Feedback for me

TICKET_PRICE = 10
SERVICE_FEE = 2
tickets = 100


def calculate_price(num_of_tickets):
    return (num_of_tickets * TICKET_PRICE) + SERVICE_FEE


while tickets != 0:
    user_name = input("What is your name? ")
    if user_name == "":
        print("You can't leave the name blank, please try again.")
        continue
    print("There are {} tickets left".format(tickets))
    print("Tickets are ${} each".format(TICKET_PRICE))
    try:
        amount_of_tickets = int(
            input("How many tickets would you like to purchase, {}? ".format(user_name.capitalize())))
        if amount_of_tickets >= 101:
            print("There are only {} tickets... Please try again.".format(
                tickets))
            continue
    except ValueError:
        print("That is an invalid entry, try again.")
    else:
        amount_due = calculate_price(amount_of_tickets)
        print("There is a service fee of ${}.".format(SERVICE_FEE))
        assure = input(
            "You would like to buy {} tickets for ${}? Y/N: ".format(amount_of_tickets, amount_due)).capitalize()
        if amount_of_tickets > tickets:
            print("There are only {} tickets left... Please try again.".format(
                tickets))
        elif assure == "Y":
            print("You have bought {} tickets for ${}".format(
                amount_of_tickets, amount_due))
            tickets -= amount_of_tickets
        elif assure == "N":
            print(
                "Well thanks for visiting the shop {}, have a good day!".format(user_name.capitalize()))
            exit()
        else:
            print("That is an invalid answer")

if tickets == 0:
    print("We are sold out... Thank you.")