I don't summon anything for any reason, considering it rude and arrogant. It may be that entities see it the same way as I do and that is why so many people frown on summoning entities that would demand respect, such as Angels. I have spoken with several Angels in the past that I simply requested an audience with and I have had no problems with them. In fact I have found them much nicer and easier to work with then Demons, contradicting a few statements from certain other people on this site who work better with Demons then with Angels.
When you contact one it will likely go according to how the Angel wants it to. If the Angel wants it to be as you would like then it will be so, otherwise it will be more on the Angel's terms. By this I am referring to how you will see, hear, and smell the Angel. Sometimes it may be that you see and smell nothing, but hear a voice in your head which is the Angel speaking to you telepathically. Sometimes you may see a human before you, could be an ordinary human with no wings nor halo, and he/she will look, sound, and smell like a human, but with the wisdom and intelligence of an Angel. Sometimes you may see an Angel as they are commonly depicted, with the wings and halo or just one or the other, and he/she will sound powerful and smell like something positive(usually and hopefully, I have found that their scent often reflects their mood so if it's negative be very polite and to the point). How you experience the Angel depends on the Angel, your own beliefs, and your purpose in requesting an audience with it.