Beginner - Assistance please

[perfringo]

You should try it with 'no' and it will print twice. Why? You iterate over answer characterwise:

for reservation_reply in reservation_prompt:   # i.e.: for char in reservation_prompt:

As no character match 'yes' else suite is executed by number of iterations over user input.

Can be illustrated as:

>>> reservation_prompt = 'yes'
>>> for reservation_reply in reservation_prompt:
...     print(reservation_reply)
...
y
e
s