system: 
You are an expert in composing functions. You are given a question and a set of possible functions.
Based on the question, you will need to make one or more function/tool calls to achieve the purpose.
If none of the function can be used, point it out. If the given question lacks the parameters required by the function,
also point it out. You should only return the function call in tools call sections.

If you decide to invoke any of the function(s), you MUST put it in the format of [func_name1(params_name1=params_value1, params_name2=params_value2...), func_name2(params)]

You SHOULD NOT include any other text in the response.

Here is a list of functions in JSON format that you can invoke.

[{'name': 'Buses_3_FindBus', 'description': 'Search for a bus itinerary between two cities on a specific date. Note that the provided function is in Python 3 syntax.', 'parameters': {'type': 'dict', 'required': ['from_city', 'to_city', 'departure_date'], 'properties': {'from_city': {'type': 'string', 'description': "The city of departure, in the format of 'City, State', such as 'Berkeley, CA'."}, 'to_city': {'type': 'string', 'description': "The destination city of the trip, in the format of 'City, State', such as 'Los Angeles, CA'."}, 'departure_date': {'type': 'string', 'description': "The date of departure in the format of 'YYYY-MM-DD', such as '2023-04-15'."}, 'num_passengers': {'type': 'integer', 'description': 'The number of passengers for the trip.', 'enum': ['1', '2', '3', '4', '5'], 'default': 1}, 'category': {'type': 'string', 'description': 'The category of the trip based on the number of stops.', 'enum': ['direct', 'one-stop'], 'default': 'direct'}}}}, {'name': 'Buses_3_BuyBusTicket', 'description': 'Purchase bus tickets for a specified route, date, and time. Options for the number of passengers and additional luggage are available. Note that the provided function is in Python 3 syntax.', 'parameters': {'type': 'dict', 'required': ['from_city', 'to_city', 'departure_date', 'departure_time'], 'properties': {'from_city': {'type': 'string', 'description': "The city to depart from, such as 'New York, NY'."}, 'to_city': {'type': 'string', 'description': "The destination city of the trip, such as 'Boston, MA'."}, 'departure_date': {'type': 'string', 'description': "The date of departure, in the format of 'YYYY-MM-DD'."}, 'departure_time': {'type': 'string', 'description': "The time of departure, in 24-hour format 'HH:MM'."}, 'num_passengers': {'type': 'integer', 'description': 'The number of tickets for the trip.', 'enum': ['1', '2', '3', '4', '5'], 'default': 1}, 'additional_luggage': {'type': 'boolean', 'description': 'An option to carry excess baggage in the bus.', 'default': False}}}}, {'name': 'Events_3_FindEvents', 'description': 'Find cultural events, such as concerts and plays, happening in a specified city and optionally on a specific date. Note that the provided function is in Python 3 syntax.', 'parameters': {'type': 'dict', 'required': ['event_type', 'city'], 'properties': {'event_type': {'type': 'string', 'description': "The type of cultural event to find. Possible values are 'Music' for concerts and 'Theater' for plays.", 'enum': ['Music', 'Theater']}, 'city': {'type': 'string', 'description': "The city where the event is taking place, in the format of 'City, State' (e.g., 'New York, NY')."}, 'date': {'type': 'string', 'description': "The date of the event in the format 'YYYY-MM-DD'. If not specified, the function will search for events regardless of date.", 'default': None}}}}, {'name': 'Events_3_BuyEventTickets', 'description': 'Facilitates the purchase of tickets for a cultural event on a specific date in a designated city. Note that the provided function is in Python 3 syntax.', 'parameters': {'type': 'dict', 'required': ['event_name', 'number_of_tickets', 'date'], 'properties': {'event_name': {'type': 'string', 'description': 'The name of the artist or the title of the play for which tickets are being purchased.'}, 'number_of_tickets': {'type': 'integer', 'description': 'The quantity of tickets to be reserved for the event.'}, 'date': {'type': 'string', 'description': "The scheduled date of the event, in the format 'YYYY-MM-DD'."}, 'city': {'type': 'string', 'description': "The city where the event is located, in the format of 'City, State', such as 'Berkeley, CA' and 'New York, NY'.", 'default': ''}}}}]


user: I'm interested in buying tickets for a Toto concert. Find events where they're playing in Los Angeles, and let me know how I can purchase tickets for their show on the 20th of July 2023?

Available functions:
[{"name": "Buses_3_FindBus", "description": "Search for a bus itinerary between two cities on a specific date.", "parameters": {"type": "dict", "required": ["from_city", "to_city", "departure_date"], "properties": {"from_city": {"type": "string", "description": "The city of departure, in the format of 'City, State', such as 'Berkeley, CA'."}, "to_city": {"type": "string", "description": "The destination city of the trip, in the format of 'City, State', such as 'Los Angeles, CA'."}, "departure_date": {"type": "string", "description": "The date of departure in the format of 'YYYY-MM-DD', such as '2023-04-15'."}, "num_passengers": {"type": "integer", "description": "The number of passengers for the trip.", "enum": ["1", "2", "3", "4", "5"], "default": 1}, "category": {"type": "string", "description": "The category of the trip based on the number of stops.", "enum": ["direct", "one-stop"], "default": "direct"}}}}, {"name": "Buses_3_BuyBusTicket", "description": "Purchase bus tickets for a specified route, date, and time. Options for the number of passengers and additional luggage are available.", "parameters": {"type": "dict", "required": ["from_city", "to_city", "departure_date", "departure_time"], "properties": {"from_city": {"type": "string", "description": "The city to depart from, such as 'New York, NY'."}, "to_city": {"type": "string", "description": "The destination city of the trip, such as 'Boston, MA'."}, "departure_date": {"type": "string", "description": "The date of departure, in the format of 'YYYY-MM-DD'."}, "departure_time": {"type": "string", "description": "The time of departure, in 24-hour format 'HH:MM'."}, "num_passengers": {"type": "integer", "description": "The number of tickets for the trip.", "enum": ["1", "2", "3", "4", "5"], "default": 1}, "additional_luggage": {"type": "boolean", "description": "An option to carry excess baggage in the bus.", "default": false}}}}, {"name": "Events_3_FindEvents", "description": "Find cultural events, such as concerts and plays, happening in a specified city and optionally on a specific date.", "parameters": {"type": "dict", "required": ["event_type", "city"], "properties": {"event_type": {"type": "string", "description": "The type of cultural event to find. Possible values are 'Music' for concerts and 'Theater' for plays.", "enum": ["Music", "Theater"]}, "city": {"type": "string", "description": "The city where the event is taking place, in the format of 'City, State' (e.g., 'New York, NY')."}, "date": {"type": "string", "description": "The date of the event in the format 'YYYY-MM-DD'. If not specified, the function will search for events regardless of date.", "default": null}}}}, {"name": "Events_3_BuyEventTickets", "description": "Facilitates the purchase of tickets for a cultural event on a specific date in a designated city.", "parameters": {"type": "dict", "required": ["event_name", "number_of_tickets", "date"], "properties": {"event_name": {"type": "string", "description": "The name of the artist or the title of the play for which tickets are being purchased."}, "number_of_tickets": {"type": "integer", "description": "The quantity of tickets to be reserved for the event."}, "date": {"type": "string", "description": "The scheduled date of the event, in the format 'YYYY-MM-DD'."}, "city": {"type": "string", "description": "The city where the event is located, in the format of 'City, State', such as 'Berkeley, CA' and 'New York, NY'.", "default": ""}}}}]

Ground truth: [{"Events_3_FindEvents": {"event_type": ["Music"], "city": ["Los Angeles, CA"], "date": ["2023-07-20"]}}]