Meeting Waheguru is not the same in Sikhi as it is in Abrahamic Faiths. There is no dialogue the same way Abraham or Moses had. Meeting Waheguru happens through Naam Abhiyas Kamaee eventually you get full darshan of Waheguru, and according to Gurmukhs the only thing one can say when having darshan is Waheguru Waheguru.....no other words can express his meeting/vision
Dhan Dhan Sri Guru Granth Sahib Ji is Vaheguru's light, so when you do Ardas, you can ask him what you want to say. Meeting Vaheguru in Nirankar form, you don't ask or say much, unless Vaheguru makes you speak.