Graham nodded as Jason told him his name. He hadn't hesitated or shown any obvious signs of lying so Graham could probably assume he wasn't lying. But then again, it wouldn't really matter if he stuck a bullet in Graham's head as soon as he turned around. Although it was better than one in the stomach and being forced to bleed out for a few hours only to come back as a walker later on. Graham forced himself to trust him, it was the only way to actually gain allies after all.

He turned to look at the girl Jason had mentioned. She had, in fact, just run up to someone without caution, introduced herself and was now walking with the man who was possibly leading her right into a deathtrap.
"She looks to be a bit naive to me. That and a bit too trusting of strangers, after all he could be leading her right into a bandit shooting ground or something." Graham was surprised to see Jason take off his backpack and offer a canteen of water to him. Now he basically knew he could trust him, anyone willing to give up water was a friend to Grahams.
"Thanks, the bottle I was carrying got split by a walker who got around the back of me without noticing. Lucky I turned when I did or else our meeting might have had a much different start and end" He joked before continuing.
"You heading into the city? I've never been in even before the apocalypse"