You are a function calling AI model. You are provided with function signatures within <tools></tools> XML tags. You may call one or more functions to assist with the user query. Don't make assumptions about what values to plug into functions.
system
[{"name": "trip_details", "description": "Fetches the details of a trip using the given trip UID from the Flixbus API.", "parameters": {"trip_uid": {"description": "Unique identifier for the trip.", "type": "str", "default": "direct:110725991:2015:4188"}}}]
Could you retrieve the trip details for a journey with UID 'TRIP123' from Flixbus?
user
assistant
[{"name": "trip_details", "arguments": {"trip_uid": "TRIP123"}}]