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': 'get_current_weather', 'description': 'Retrieves the current weather conditions for a specified location in the desired temperature unit. Note that the provided function is in Python 3 syntax.', 'parameters': {'type': 'dict', 'required': ['location'], 'properties': {'location': {'type': 'string', 'description': "The location for which to get the weather, in the format of 'City, State', such as 'San Francisco, CA' or 'New York, NY'."}, 'unit': {'type': 'string', 'description': 'The unit of temperature for the weather report.', 'enum': ['celsius', 'fahrenheit'], 'default': 'fahrenheit'}}}}, {'name': 'add_postgres_server', 'description': 'Add a new PostgreSQL server configuration or update an existing one with the provided settings. Note that the provided function is in Python 3 syntax.', 'parameters': {'type': 'dict', 'required': ['host', 'username', 'password'], 'properties': {'host': {'type': 'string', 'description': 'The hostname or IP address of the PostgreSQL server.'}, 'port': {'type': 'integer', 'description': 'The port number on which the PostgreSQL server is running. Defaults to the standard PostgreSQL port.', 'default': 5432}, 'database': {'type': 'string', 'description': "The name of the target database on the PostgreSQL server. If not provided, defaults to 'postgres'.", 'default': 'postgres'}, 'username': {'type': 'string', 'description': 'The username for authentication with the PostgreSQL server.'}, 'password': {'type': 'string', 'description': 'The password for authentication with the PostgreSQL server.'}}}}]


user: I need to establish a new Postgres server for our Canada office. The server's domain is 'http://plgah.ca', the database should be 'finance_db', the username will be 'pascal', and use a secure password 123123.

Available functions:
[{"name": "get_current_weather", "description": "Retrieves the current weather conditions for a specified location in the desired temperature unit.", "parameters": {"type": "dict", "required": ["location"], "properties": {"location": {"type": "string", "description": "The location for which to get the weather, in the format of 'City, State', such as 'San Francisco, CA' or 'New York, NY'."}, "unit": {"type": "string", "description": "The unit of temperature for the weather report.", "enum": ["celsius", "fahrenheit"], "default": "fahrenheit"}}}}, {"name": "add_postgres_server", "description": "Add a new PostgreSQL server configuration or update an existing one with the provided settings.", "parameters": {"type": "dict", "required": ["host", "username", "password"], "properties": {"host": {"type": "string", "description": "The hostname or IP address of the PostgreSQL server."}, "port": {"type": "integer", "description": "The port number on which the PostgreSQL server is running. Defaults to the standard PostgreSQL port.", "default": 5432}, "database": {"type": "string", "description": "The name of the target database on the PostgreSQL server. If not provided, defaults to 'postgres'.", "default": "postgres"}, "username": {"type": "string", "description": "The username for authentication with the PostgreSQL server."}, "password": {"type": "string", "description": "The password for authentication with the PostgreSQL server."}}}}]

Ground-truth function call:
[{"add_postgres_server": {"host": ["http://plgah.ca"], "port": ["", 5432], "database": ["finance_db"], "username": ["pascal"], "password": ["123123"]}}]