Saving n individual objects to a class

I'm making a phonebook and I'm trying to figure out what I'm doing wrong. I have defined a class "people" which should create individual "profiles" for each person that enters in their name and phone-number. Then I have a function that works as the UI for the user. The problem occurs when you try to "lookup" a profile using the name. Python simply tells me that the string object given(the name) doesn't have a "number" attribute.

The code:

class people:
    def __init__(self, number):
        self.number = number

def main():
    while True:
        command = str(input(('phoneBook> ')))
        segment = command.split()

        if segment[0] == 'add':

            segment[1] = people(segment[2])
            print(segment[1].number)

        if segment[0] == 'lookup':

            print(segment[1].number)

        if segment[0] == 'quit':
            pass

Any help is greatly appreciated, and any tips on working with classes or on this specific issue would be great!

Thanks! - TheBigChung