When we make doa, we are expecting an immediate answer from Allah.
The thing is, our doa getting answered immediately or not is nothing to do with either Allah is happy with us or not. There is no connection between these two.
E.g. Nabi Nuh invited his nation for islam for 950 years. Do you think this kind of guy was not making doa for his son and wife?Nabi Muhammad was not making doa for his uncles – Abu Talib and Abu Lahab? Nabi Yaakub a.s not making doa for his twelwe sons?
Listen more to Nouman Ali Khan for How Doa works at https://goo.gl/VGsX4E