An English man, somewhat older than you, seems to have been watching you as you sit studying in a public place (such as a park or library). He may be entirely innocent and friendly, but you are not confident enough to be sure. He 'catches your eye', engages you in conversation and invites you to join him on the terrace of a local cafe. You do not wish to hurt his feelings, but neither would you be comfortable going with him. What do you say?

'No, Thank You'