docstr: Add information about availability of the booking option.
docstr_tok: ["Add","information","about","availability","of","the","booking","option","."]
code: def addBookingPointer(self, turn_da):
      """Add information about availability of the booking option."""
      # Booking pointer
      # Do not consider booking two things in a single turn.
      vector = [0, 0]
      if turn_da.get("booking-nobook"):
          vector = [1, 0]
      if turn_da.get("booking-book") or turn_da.get(
          "train-offerbooked"
      ):
          vector = [0, 1]
      return vector
  
file_path: TextBox/textbox/evaluator/utils/multiwoz/db_ops.py
imports: import json, random, sqlite3
  from .ontology import all_domains, db_domains
label_desc: Use image node_id 3 for calling the MultiWozDB obj's underlying member method code with example usage: obj.addBookingPointer(turn_da) and returns: vector