Conversation so far:
when was george mallory in europe?
1910.
what did he do in europe?
Mallory and a friend attempted to climb Mont Velan in the Alps.
were they successful in their attempt?
turned back shortly before the summit due to Mallory's altitude sickness.
did they try again?
CANNOTANSWER.

Question: did he climb with anyone?
Self-contained rewrite: did George Mallory climb with anyone?