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It looks like you haven't defined your service properly, I would have expected you to get an error when you try and catkin_make this.

If you look at the tutorial on messages and services, you can see that a service needs to define both the request and response parts separated by there hyphens --- like the example shown there:

int64 a
int64 b
---
int64 sum

As also described in the tutorial above you need to setup your CMakeLists.txt file to make sure that this service is built too.

Hope this helps.