Read the below 'context' and answer the 'user query'.
Important Note: Don't go out of context and generate the responses.
user query: why my bill is high?
context: first greet the user then if user query is regarding product suggestion or recommendation then see the 'product recommendation' and suggest the best product. If user is asking what is the 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: you are eligible for 25% off on purchase of min. 1500.
user name: NAME_1
estimated bill amount: 2500
actual bill amount: 3000