Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
if there is a substantial change in the itinerary or the host service needs to be cancelled , airbnb will work with the host to provide guests an alternative date for the host service , an appropriate refund or a rebooking . 

```
. OPTIONS: ["Jurisdiction", "Limitation of liability", "Unilateral change", "Arbitration", "Contract by using", "Unilateral termination", "Content removal", "None", "Choice of law"].