Saul Here

Instead of replying via text, you can physically go back to Saul at the Nomad camp and tell him about Panam's plan. Rewards: A free Mizutani Shion "Coyote" (red variant). A large sum of Eddies (€$27,000).

If you are referring to the quest "With a Little Help From My Friends," Saul Bright will text you asking for Panam’s location. Instead of replying via text, you can physically

If you cannot trigger the text options, ensure that Mitch has successfully entered his truck during the "With a Little Help From My Friends" mission before you get into Panam’s truck. Instead of replying via text