Prevent writing an infinite loop

This code takes user input and stores it into a file ,and then it saves the time the user visited in another separate file.

    import date time 
    Today = date time.date time.now()
    name = input('Whats your name :')
    filename = 'guests'

    with open (filename, 'a') as file_object:
      file_object.write(name +'.n')
    while name:
       print('Welcome,how are you doing '  + name)
    filename = "guest_book"
    with open(filename,'a') as file_object:
        file_object.write(name + 'visited on ' + Today.string('%c') + '.n') 
        run = False
    ```

 - List item

I always find myself writing infinite loops , this program works but i have to cancel out with control c. How can I avoid writing infinite loops.The variable `run = True` and 'run = False' I got from another post but I feel as if it isn't necessary.