input: Write a python function to respond to a user's message for various inputs.
  assert respond_to_message("hello") in bot_greetings
  assert respond_to_message("I need to book a ticket.") == "To book a ticket, you can enter your travel details here ."
  assert respond_to_message("Can you help me find a hotel?") == "To book a hotel room, you can enter your dates and other details here ."
  assert respond_to_message("What time is it?") == "I don't understand your query. Please enter a valid input!"
output: def respond_to_message(message):
      bot_greetings = ["Hi there!", "Hello!", "Hey! How can I help you?"]
      
      if message.lower() in ["hi", "hello", "hey"]:
          return bot_greetings[0]
      elif message.lower() == "i need to book a ticket.":
          return "To book a ticket, you can enter your travel details here ."
      elif message.lower() == "can you help me find a hotel?":
          return "To book a hotel room, you can enter your dates and other details here ."
      else:
          return "I don't understand your query. Please enter a valid input!"