import re
def is_phone_number(text):
    reg = re.compile("\d{3}[-]\d{3}[-]\d{4}")
    results = reg.findall(text)
    return results


message = 'Call me at 415-555-1011 tomorrow. 415-555-9999 is my office.'

for chunk in is_phone_number(message):
    print('Phone number found: ' + chunk)
print('Done')