Just happened! -
Me "Thomson 5BP contact London 132.860"
Him "132.860 Thomson 5BP, Goodnight"
North American voice "Who was that last call for?"
(Before I could reply) "Morning London Cactus 758, 370"
Me "Cactus 758 good morning route direct MID"
"Direct MID thanks 758"
Only had 2 other Americans on frequency so thought i'd check they were still with me -
"United 944 you still on?"
Reply "944 Negative"
Really didn't know how to answer that one! perhaps I should have said please come back!