as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
create a list of input parameters and output variables for a website that can be used to check the availability of flights.
user
input parameters: 
- departure airport 
- arrival airport 
- departure time 
- number of passengers 
- return/one-way

output variables: 
- airfare
- flight times 
- availability 
- routes 
- baggage allowance 
- flight duration 
- changes/cancellations 
- connection/stopover options
assistant