HELP TabError: inconsistent use of tabs and spaces in indentation

[blackjesus24]

Hi there, i'm trying to print my code but it gives me this error:

Error:
  File "C:\Users\jay\Desktop\asd.py", line 6
    print("Checking in passenger: " + current_passenger)
                                                       ^
TabError: inconsistent use of tabs and spaces in indentation
[Finished in 0.1s with exit code 1]

Here is my code.

def passengers(not_checked_in, checked_in):
	"""Simulate passengers who are not checked in."""

	while not_checked_in:
		current_passenger = not_checked_in.pop()
		
        print("Checking in passenger: " + current_passenger)
        checked_in.append(current_passenger)

def show_checked_in_passengers(checked_in):
  print("\nThe following passengers have been checked in ")
  for passengers in checked_in:
     print(passengers)


not_checked_in = ["Jay Senyani"]
checked_in = []

passengers(not_checked_in, checked_in)
show_checked_in_passengers(checked_in)

I'm new at python so any help would be much appreciated :-)