"That sounds awfully delightful Doctor smith, But I'm afraid that I'm getting married tomorrow so i must with good conscience say no."
"Well....that's all and good, But there's one thing i forgot to mention-"
"That your marvelous machine travels through time as well?"
"Oohh..You are clever.! well, Best be off. places to see planets to save...and an awful lot of running to do. But i will come by for a cup of tea eh?"