import re
docs = ['Hi, my name is Eric. Are you blue?',
        "Hi, I'm ! What is your name?", 
        'This is a great idea. I would love to go.', 
        'Hello, I am Jane Brown. What is your name?', 
        "Hello, I am a doctor! Let's go to the mall.",
        'I am ready to go. Mom says hello.']
docs = [re.sub(r'^H(?:ello|i)\b.*?[.?!]\s+', '', doc) for doc in docs]
print(docs)