Didn't like the ending?

'I enjoyed that book' says the customer

'Great' I say

'But I didn't like the ending' she looks at me expectantly

'Oh I haven't read that one', I say

'No I didn't like the ending' More looking at me expectantly. I begin to worry 'What was wrong with it'

'It was as if there is going to be a sequel' the customer says

'Maybe there will be' , I am getting a bit desperate what does this customer want me to say?

'The ending was very disappointing' More looking and a silence develops

I decide to take the plunge 'I can't change the ending'

'Oh I know but it was very disappointing'