what color tie goes with sky blue dress and dark solid navy suit?

Your shirt and suit are quite neutral, so you're working with a nearly blank canvas. Since the shirt and suit are also both solid, I would recommend a pattern, stripes, or a texture to add interest.

Orange is the complementary color of blue, so orange will really pop when paired with blue.

http://us.123rf.com/400wm/400/400/feedough/feedoug...

Pink is daring depending on the crowd, but it will exude confidence. Consider a pattern like paisley:

http://www.tie-a-tie.net/blog/wp-content/uploads/2...

Soften yellow with a pattern, especially a blue that matches your suit:

http://www.colbertnewshub.com/wp-content/uploads/2...

Red is probably too aggressive for networking or it will almost disappear since it's so common among politicians to wear red ties:

http://www.lampebatkin.com/files/2013/07/businessI...

I think that since you have such a cool palette to work with, you should stick with warmer tones for the tie. You can do either solids or patterns, depending on your tastes. If you are looking to draw attention to yourself, then definitely go with a patterned tie over a solid. The solids are boring if you pair them with solids. However, they are the only choice if you choose a patterned shirt.