Predict the sentiment ("positive" or "negative") of the following sentence.
The customer service team was unhelpful and slow.
The sentiment of the sentence is negative.
Complete the following task based on the instruction and optional input provided.### Instruction:
Predict the sentiment ("positive" or "negative") of the following sentence.

### Input:
The customer service team was unhelpful and slow.

### Output:
The sentiment of the sentence is negative.