Rose glanced at the screen of his phone. "I'll have to give him a call later." Before he could offer to write the number down for her, she explained, "I have a good memory." She recited the number, just to prove that. Of course she had no intention of calling him. By the time she was in London, it was likely she wouldn't be able to remember the number.
"Are you going to this party? You're going to be late if you follow me home."