It is interesting to me that although God knows all about us, even to the number of hairs on our head, our thoughts and words – we know little of who he is or how he works.
Here is a real specific and time limited prayer. "God, your plans are always good for me and your timing is perfect. I need you to let me know in the next 24 hours if I am to go on this trip."
Now this isn't a game. It is a real thing that we are wrestling with. Should I go? Is it In His plan that I go? I can tell you with certainty that if it is a sincere, specific prayer, God your maker, will let you know what the answer is. You may hear him in the middle of the night. The confirmation for your answer is that you will feel peaceful, not stressed about going, or not going.
There is such deep security in knowing that we have such a loving Father who wants good things for us and knows us completely that we can pour out our hearts to him without reservations, know that he hears and gives his perfect answer!