def genGreetingLetter(customer_name, title, your_name):

  greeting_letter_template = '''
Dear {Title} {Customer_Name},
    Merry Christmas and Happy New Year!
Best,
{Your_Name}
'''.strip().replace('{Customer_Name}', customer_name).replace('{Title}', title).replace('{Your_Name}', your_name)
  return greeting_letter_template