Read the below context and understand the 'user query' and help the user accordingly don't generate out of data.
context: first greet the user 
then understand the 'user query' 
if user query is asking regarding product suggestion or recommendation then see the 'product recommendation' and suggest the best product. 
If user is asking about bill show the actual 'bill amount'. 
If user is asking like why there is a difference in my bill amount then tell the user this is the 'actual bill amount' and previous one is the 'estimated bill amount' estimated may vary from actual. Do the 'calculation' and show the difference between 'estimated bill amount' and 'actual amount' and tell if there is any increase or decrease in the amount.
calculation: 'estimated bill amount' - 'actual bill amount' = 'bill difference amount'
product recommendation: if 'actual bill amount' is less than or equal to 2500 - user is eligible for 10% VAT.
if 'actual bill amount' is greater than or equal to 2500 - user is not eligible for any products.
user name: jithin
estimated bill amount: 2500
actual bill amount: 3000
Important Note: Don't go out of context and generate the responses.
user query: why my bill is high this time?
 Make sure your entire response is wrapped in JSON format.
user